diff --git a/cmd/grpcannon/main.go b/cmd/grpcannon/main.go
index 25dd5391..3aeadd50 100644
--- a/cmd/grpcannon/main.go
+++ b/cmd/grpcannon/main.go
@@ -31,7 +31,8 @@ var (
 	n = flag.Int("n", 200, "Number of requests to run. Default is 200.")
 	q = flag.Int("q", 0, "Rate limit, in queries per second (QPS). Default is no rate limit.")
 	t = flag.Int("t", 20, "Timeout for each request in seconds.")
-	z = flag.Duration("z", 0, "")
+	z = flag.Duration("z", 0, "Duration of application to send requests.")
+	x = flag.Duration("x", 0, "Maximum duration of application to send requests.")
 
 	data     = flag.String("d", "", "The call data as stringified JSON.")
 	dataPath = flag.String("D", "", "Path for call data JSON file.")
@@ -70,6 +71,9 @@ Options:
   -z  Duration of application to send requests. When duration is reached,
       application stops and exits. If duration is specified, n is ignored.
       Examples: -z 10s -z 3m.
+  -x  Maximum duration of application to send requests with n setting respected.
+      If duration is reached before n requests are completed, application stops and exits.
+      Examples: -x 10s -x 3m.
   
   -d  The call data as stringified JSON.
   -D  Path for call data JSON file. For example, /home/user/file.json or ./file.json.
@@ -132,7 +136,7 @@ func main() {
 			iPaths = strings.Split(pathsTrimmed, ",")
 		}
 
-		cfg, err = config.New(*proto, *protoset, *call, *cert, *cname, *n, *c, *q, *z, *t,
+		cfg, err = config.New(*proto, *protoset, *call, *cert, *cname, *n, *c, *q, *z, *x, *t,
 			*data, *dataPath, *md, *mdPath, *output, *format, host, *ct, *kt, *cpus, iPaths)
 		if err != nil {
 			errAndExit(err.Error())
diff --git a/config/config.go b/config/config.go
index 4f684799..4248f792 100644
--- a/config/config.go
+++ b/config/config.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"math"
 	"path/filepath"
 	"runtime"
 	"strings"
@@ -23,6 +24,7 @@ type Config struct {
 	C             int                `json:"c"`
 	QPS           int                `json:"q"`
 	Z             time.Duration      `json:"z"`
+	X             time.Duration      `json:"x"`
 	Timeout       int                `json:"t"`
 	Data          interface{}        `json:"d,omitempty"`
 	DataPath      string             `json:"D"`
@@ -38,8 +40,8 @@ type Config struct {
 }
 
 // New creates a new config
-func New(proto, protoset, call, cert, cName string, n, c, qps int, z time.Duration, timeout int,
-	data, dataPath, metadata, mdPath, output, format, host string,
+func New(proto, protoset, call, cert, cName string, n, c, qps int, z time.Duration, x time.Duration,
+	timeout int, data, dataPath, metadata, mdPath, output, format, host string,
 	dialTimout, keepaliveTime, cpus int, importPaths []string) (*Config, error) {
 
 	cfg := &Config{
@@ -52,6 +54,7 @@ func New(proto, protoset, call, cert, cName string, n, c, qps int, z time.Durati
 		C:             c,
 		QPS:           qps,
 		Z:             z,
+		X:             x,
 		Timeout:       timeout,
 		DataPath:      dataPath,
 		MetadataPath:  mdPath,
@@ -174,6 +177,7 @@ func (c *Config) UnmarshalJSON(data []byte) error {
 	type Alias Config
 	aux := &struct {
 		Z string `json:"z"`
+		X string `json:"x"`
 		*Alias
 	}{
 		Alias: (*Alias)(c),
@@ -199,6 +203,7 @@ func (c Config) MarshalJSON() ([]byte, error) {
 	return json.Marshal(&struct {
 		*Alias
 		Z string `json:"z"`
+		X string `json:"x"`
 	}{
 		Alias: (*Alias)(&c),
 		Z:     c.Z.String(),
@@ -263,6 +268,14 @@ func (c *Config) initMetadata() error {
 	return nil
 }
 
+func (c *Config) initDurations() {
+	if c.X > 0 {
+		c.Z = c.X
+	} else if c.Z > 0 {
+		c.N = math.MaxInt32
+	}
+}
+
 func (c *Config) init() error {
 	err := c.initData()
 	if err != nil {
@@ -274,6 +287,8 @@ func (c *Config) init() error {
 		return err
 	}
 
+	c.initDurations()
+
 	c.Default()
 
 	err = c.Validate()
diff --git a/config/config_test.go b/config/config_test.go
index 3ef39b5a..f9e85369 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -3,6 +3,7 @@ package config
 import (
 	"encoding/json"
 	"io/ioutil"
+	"math"
 	"os"
 	"runtime"
 	"testing"
@@ -11,7 +12,7 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
-const expected = `{"proto":"asdf","protoset":"","call":"","cert":"","cName":"","n":0,"c":0,"q":0,"t":0,"D":"","M":"","o":"","O":"oval","host":"","T":0,"L":0,"cpus":0,"z":"4h30m0s"}`
+const expected = `{"proto":"asdf","protoset":"","call":"","cert":"","cName":"","n":0,"c":0,"q":0,"t":0,"D":"","M":"","o":"","O":"oval","host":"","T":0,"L":0,"cpus":0,"z":"4h30m0s","x":""}`
 
 func TestConfig_MarshalJSON(t *testing.T) {
 	z, _ := time.ParseDuration("4h30m")
@@ -418,3 +419,31 @@ func TestConfig_initData(t *testing.T) {
 		assert.Equal(t, c.Data, data)
 	})
 }
+
+func TestConfig_initDurations(t *testing.T) {
+	t.Run("with Z specified should set N to max int", func(t *testing.T) {
+		dur, _ := time.ParseDuration("4h30m")
+		c := &Config{N: 500, Z: dur}
+		c.initDurations()
+		assert.Equal(t, c.N, math.MaxInt32)
+	})
+
+	t.Run("with X specified should set Z to X and keep N", func(t *testing.T) {
+		dur, _ := time.ParseDuration("4h30m")
+		c := &Config{N: 500, X: dur}
+		c.initDurations()
+		assert.Equal(t, c.N, 500)
+		assert.Equal(t, c.X, dur)
+		assert.Equal(t, c.Z, dur)
+	})
+
+	t.Run("with X and Z specified should set Z to X and keep N", func(t *testing.T) {
+		dur, _ := time.ParseDuration("4m")
+		dur2, _ := time.ParseDuration("5m")
+		c := &Config{N: 500, X: dur, Z: dur2}
+		c.initDurations()
+		assert.Equal(t, c.N, 500)
+		assert.Equal(t, c.X, dur)
+		assert.Equal(t, c.Z, dur)
+	})
+}
diff --git a/testdata/localhost.crt b/testdata/localhost.crt
index 27eff570..478d2248 100644
--- a/testdata/localhost.crt
+++ b/testdata/localhost.crt
@@ -1,18 +1,18 @@
 -----BEGIN CERTIFICATE-----
-MIIC5TCCAc2gAwIBAgIJALLvqFlCiW3VMA0GCSqGSIb3DQEBCwUAMBQxEjAQBgNV
-BAMMCWxvY2FsaG9zdDAeFw0xODA0MDcxNjU0MjRaFw0xODA1MDcxNjU0MjRaMBQx
+MIIC5TCCAc2gAwIBAgIJAJFwlruqLNgaMA0GCSqGSIb3DQEBCwUAMBQxEjAQBgNV
+BAMMCWxvY2FsaG9zdDAeFw0xODA2MDExNjA1NDNaFw0xODA3MDExNjA1NDNaMBQx
 EjAQBgNVBAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoC
-ggEBANzmciFhitqzmsHLHKCx/yMHFYOAXHBFnWras+NcW/5iDym1Oe1QgXn0y1cX
-1b9cINcL5xHiNjI3iFW2/FPQ8TZ2OpFx3MA/HW0raOyZqofubfSiyQXJV2pi+5ps
-jP/9/ogPlXuWjtmAsn923XhexKOLxDk3n5khgD74txrcOtX8VGPGnMHLDtUWCdiZ
-wSKocWNqU2+rMw3fivuyzPKVx5uMB3FDjqIHTTyrLRSR8WtRZQaI+XsIXiYC31tV
-nEnve2LoPRboNgdVDb7rXp/x2SUOQHN2menLy3P6kkUiAG787oxdxl2v0dcgPGWD
-TWvrwbE2nckZ+wQlruVkQ5JQWH8CAwEAAaM6MDgwFAYDVR0RBA0wC4IJbG9jYWxo
+ggEBALQ1gPZBLD2D4HBveN4eRzal1r8lX4AQSq9h4ofcMo/0sqz7yEQ3zH41Ff+U
+KyeBSpXQ6eHtQNiJAATFNPzmHtCbS/YsE18+Msab+Qz0Bgk3pCM97k7japl6Hzag
+83C/c2U1Wr3i5otCUQhk+pY2zWjh07gRZWmkp10Ijapxf7mQwC3u2vguzfXEE9co
+BS2wyRiJxbwN3DIhW7fTZfoOgfnEGktrTF+hlO8YPNfodZum0jwrlv0hAwYfDiIJ
+yQmNMbBLAcZIeH/ZKXEKQkFFKYfxYVMM9Hf4B2XOJ8z7M5o0R+l059RHqric6/c1
+9XPvfDvWSIijI5HgymNAUZmFT+ECAwEAAaM6MDgwFAYDVR0RBA0wC4IJbG9jYWxo
 b3N0MAsGA1UdDwQEAwIHgDATBgNVHSUEDDAKBggrBgEFBQcDATANBgkqhkiG9w0B
-AQsFAAOCAQEAO+9sIEkbZl5ssOgc027hYhhsUe+0FxQp5GxOshZMFvLlgDzJxMF2
-UwLgNjJHaK8kkEtGSQy8Qg02vF+iuZMYGknGHyjCSOyriDhsynh7085cRPq91d+9
-Rj2egomZYCQlOaWyqB7jA6pZM5JHBQOGPJttuASFZC8IdhNrI25Ki8JBibpT3DqK
-BJP4PccK8gGT5yxtv7fYf3Tp4Spsiqk0yyRawAIKXCbIpSTY7MrjYJ9iqzTT7WiY
-NXMRASmS7yTP4NK8Um1X6GP4+gAuh5UeNnYAGFCqqYznxrohoNbqEnp3E4Oqy/EQ
-6qe8HePlE+oho7TecaZRvuLXcHMCVatJMA==
+AQsFAAOCAQEAK3MQsX8AN9x1FeOV79Qitk9Hzy0UoGDGcfn/so/2cAbU1mY1Uk6h
+W9iCLiBKrKkoO8Ys6hR5Rx5f809pbe7hKmyQ4C0WdGxwUydAPloKj4kvf8oWcPRd
+SYxuaeD7I/tGuet7A5krneUKJi2bZtB/8OiDg64PRHNbK3wU25yB9t14aQbeXEzF
+qDlId9HZVZLVOb0G/XhcSX5kHiVVrk97x3hXsMh8iAt7zjbn2y8QitKsTpGpfsZ2
+j2a8OoV/shKt20Ea7zGMc/U/UDp3auKnD1RMA1Z11sht5cW+l8YTJ7UVLfZEdlnP
+XQSacAbjHwZ/YxEdSCiKTc+8wHGTb28aeQ==
 -----END CERTIFICATE-----
diff --git a/testdata/localhost.key b/testdata/localhost.key
index e024c723..898e7cd7 100644
--- a/testdata/localhost.key
+++ b/testdata/localhost.key
@@ -1,27 +1,28 @@
------BEGIN RSA PRIVATE KEY-----
-MIIEpQIBAAKCAQEA3OZyIWGK2rOawcscoLH/IwcVg4BccEWdatqz41xb/mIPKbU5
-7VCBefTLVxfVv1wg1wvnEeI2MjeIVbb8U9DxNnY6kXHcwD8dbSto7Jmqh+5t9KLJ
-BclXamL7mmyM//3+iA+Ve5aO2YCyf3bdeF7Eo4vEOTefmSGAPvi3Gtw61fxUY8ac
-wcsO1RYJ2JnBIqhxY2pTb6szDd+K+7LM8pXHm4wHcUOOogdNPKstFJHxa1FlBoj5
-ewheJgLfW1WcSe97Yug9Fug2B1UNvuten/HZJQ5Ac3aZ6cvLc/qSRSIAbvzujF3G
-Xa/R1yA8ZYNNa+vBsTadyRn7BCWu5WRDklBYfwIDAQABAoIBAQDMdjBlXVecnmk7
-vrg8tQQmc8Qh94mYEZdm9A9U/oPXrQPD4w4+7ikprL8ZWeJqQOfUpBu4ndz0FhqG
-29wp6FebxUronK9q8gBWr7tqY8FIGBSGPrY6OOZEfmHLyXWo7HvPjD0cK3sFLu4I
-tQjBBVaU2iVBoI6EulFt99/jaLy8mhyqF6vvXKmDQ3/h4SavRK2NXWg8JxEL5UVk
-53qLjy8e5bosbld9X6zMWAVpJnrMm6L20mPnx7Cd4aDwuRmW1HbeO6pmOWTbJYB/
-EPNaXZ4fuVJ8Ge6s33+iYb9ig3PdDqXkktN/Mx9w6APOQy1nzTcQv5SGl8PE6DFy
-vWMpVzahAoGBAPyvoyBy9Oozfrg1NEOB4CC2FauF/cVMBBffurzJbL9f/TCGm9B/
-4vKzBgVzFdWX0fig9qUtopqGkS5qNOuCYV7D5iiiS6t9+C6ZeO4AtEyDyH08GBPe
-Li1by2wP7jM2kCiklMl8thmILRwM4IB/x7v6jh7flkLF+vwnCr6bcnQFAoGBAN/M
-F1+UowYYBhQeQHfnVK1Pre7Bc/pLtuFIPn4tnAw91VR33Mh3OcQ2Zs5TU4s+lJO8
-ZtDGA4g2SHS3sKRJsuNmbeViJQLHCTG1b4a0ikV0QNdDzwpdDqaCmJSTFRXKIYFW
-kmlL+RE8vMiSir8Z6S4VouLJqK3XYPGYjt9EGqWzAoGBAOKrF3UTShoQ6XqK14A7
-L/eH/zZnMvbaMs3Lt3KEaZXeoHv4NCu7nLTD3QHkc9CvqP4UPkx7/GILlo6BXUlq
-IrhkmMEYnTKQBKKgr3cokJQWnzGgR6UC6H9t2bPtMmskZfrfcEyyH5QVsQl5j6YV
-efFpWDXfsaXifTvWNfA391qVAoGBAKYe8c6iH2zbkk+GsSYP0hwfxCUw9iz53NNW
-9ARnSKkRkPP1US6AyaFrHF7VHXODzXfoZo1cHq0SVjBFVdptVltT4gleE8j/A0Uh
-v5pHE0hA5gykKeAweTqCQE4w63rUIpDGOUHuAgCYjC16EYGO8zahGtqrBAmekThk
-nND/1aPfAoGAMMCkYRHRwEoJBa4LoRg2kJw76s6MGeVQ1FhC5R1S1HQMm/ODP2ul
-jlk+ZXM+r/rnQXCyVG8i/mAH44A1fiL/vDUiHDwOjQYLNz/dVH3fHbWA/sCf68tm
-8Tuv6mGqQUSW13H9jIueY8RwKgIFPcGVCY9ThtXsf8WpQROPmiZSwbg=
------END RSA PRIVATE KEY-----
+-----BEGIN PRIVATE KEY-----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+-----END PRIVATE KEY-----