diff --git a/include/session/config/user_profile.h b/include/session/config/user_profile.h
index 36ec4c04..7cea2283 100644
--- a/include/session/config/user_profile.h
+++ b/include/session/config/user_profile.h
@@ -62,6 +62,13 @@ LIBSESSION_EXPORT int user_profile_get_nts_priority(const config_object* conf);
 // higher priority in the conversation list.
 LIBSESSION_EXPORT void user_profile_set_nts_priority(config_object* conf, int priority);
 
+// Gets the Note-to-self message expiry timer (seconds).  Returns 0 if not set.
+LIBSESSION_EXPORT int user_profile_get_nts_expiry(const config_object* conf);
+
+// Sets the Note-to-self message expiry timer (seconds).  Setting 0 (or negative) will clear the
+// current timer.
+LIBSESSION_EXPORT void user_profile_set_nts_expiry(config_object* conf, int expiry);
+
 #ifdef __cplusplus
 }  // extern "C"
 #endif
diff --git a/include/session/config/user_profile.hpp b/include/session/config/user_profile.hpp
index 2ce3ca69..ca99bfbf 100644
--- a/include/session/config/user_profile.hpp
+++ b/include/session/config/user_profile.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <chrono>
 #include <memory>
 #include <session/config.hpp>
 
@@ -9,6 +10,8 @@
 
 namespace session::config {
 
+using namespace std::literals;
+
 /// keys used in this config, either currently or in the past (so that we don't reuse):
 ///
 /// n - user profile name
@@ -16,6 +19,7 @@ namespace session::config {
 /// q - user profile decryption key (binary)
 /// + - the priority value for the "Note to Self" pseudo-conversation (higher = higher in the
 ///     conversation list).  Omitted when 0.  -1 means hidden.
+/// e - the expiry timer (in seconds) for the "Note to Self" pseudo-conversation.  Omitted when 0.
 
 class UserProfile final : public ConfigBase {
 
@@ -62,6 +66,14 @@ class UserProfile final : public ConfigBase {
     /// Sets the Note-to-self conversation priority. -1 for hidden, 0 for unpinned, higher for
     /// pinned higher.
     void set_nts_priority(int priority);
+
+    /// Returns the current Note-to-self message expiry timer, if set, or std::nullopt if there is
+    /// no current expiry timer set.
+    std::optional<std::chrono::seconds> get_nts_expiry() const;
+
+    /// Sets the Note-to-self message expiry timer.  Call without arguments (or pass a zero time) to
+    /// disable the expiry timer.
+    void set_nts_expiry(std::chrono::seconds timer = 0s);
 };
 
 }  // namespace session::config
diff --git a/src/config/user_profile.cpp b/src/config/user_profile.cpp
index fb7d0cc4..d8d0bb03 100644
--- a/src/config/user_profile.cpp
+++ b/src/config/user_profile.cpp
@@ -108,3 +108,21 @@ LIBSESSION_C_API int user_profile_get_nts_priority(const config_object* conf) {
 LIBSESSION_C_API void user_profile_set_nts_priority(config_object* conf, int priority) {
     unbox<UserProfile>(conf)->set_nts_priority(priority);
 }
+
+void UserProfile::set_nts_expiry(std::chrono::seconds expiry) {
+    set_positive_int(data["e"], expiry.count());
+}
+
+std::optional<std::chrono::seconds> UserProfile::get_nts_expiry() const {
+    if (auto* e = data["e"].integer(); e && *e > 0)
+        return std::chrono::seconds{*e};
+    return std::nullopt;
+}
+
+LIBSESSION_C_API int user_profile_get_nts_expiry(const config_object* conf) {
+    return unbox<UserProfile>(conf)->get_nts_expiry().value_or(0s).count();
+}
+
+LIBSESSION_C_API void user_profile_set_nts_expiry(config_object* conf, int expiry) {
+    unbox<UserProfile>(conf)->set_nts_expiry(std::max(0, expiry) * 1s);
+}
diff --git a/tests/test_config_userprofile.cpp b/tests/test_config_userprofile.cpp
index 08bb683d..38a87c06 100644
--- a/tests/test_config_userprofile.cpp
+++ b/tests/test_config_userprofile.cpp
@@ -68,11 +68,13 @@ TEST_CASE("user profile C API", "[config][user_profile][c]") {
     free(to_push);
     free(to_push_decrypted);
 
-    // This should also be unset:
+    // These should also be unset:
     auto pic = user_profile_get_pic(conf);
     CHECK(strlen(pic.url) == 0);
+    CHECK(user_profile_get_nts_priority(conf) == 0);
+    CHECK(user_profile_get_nts_expiry(conf) == 0);
 
-    // Now let's go set a profile name and picture:
+    // Now let's go set them:
     CHECK(0 == user_profile_set_name(conf, "Kallie"));
     user_profile_pic p;
     strcpy(p.url, "http://example.org/omg-pic-123.bmp");  // NB: length must be < sizeof(p.url)!
@@ -235,11 +237,14 @@ TEST_CASE("user profile C API", "[config][user_profile][c]") {
     user_profile_set_name(conf, "Nibbler");
     user_profile_set_name(conf2, "Raz");
 
-    // And, on conf2, we're also going to change the profile pic:
+    // And, on conf2, we're also going to change some other things:
     strcpy(p.url, "http://new.example.com/pic");
     memcpy(p.key, "qwert\0yuio1234567890123456789012", 32);
     user_profile_set_pic(conf2, p);
 
+    user_profile_set_nts_expiry(conf2, 86400);
+    CHECK(user_profile_get_nts_expiry(conf2) == 86400);
+
     // Both have changes, so push need a push
     CHECK(config_needs_push(conf));
     CHECK(config_needs_push(conf2));
@@ -311,6 +316,8 @@ TEST_CASE("user profile C API", "[config][user_profile][c]") {
 
     CHECK(user_profile_get_nts_priority(conf) == 9);
     CHECK(user_profile_get_nts_priority(conf2) == 9);
+    CHECK(user_profile_get_nts_expiry(conf) == 86400);
+    CHECK(user_profile_get_nts_expiry(conf2) == 86400);
 
     config_confirm_pushed(conf, to_push->seqno, "fakehash4");
     config_confirm_pushed(conf2, to_push2->seqno, "fakehash4");