diff --git a/changelog.d/13584.misc b/changelog.d/13584.misc
new file mode 100644
index 000000000000..6b190181c813
--- /dev/null
+++ b/changelog.d/13584.misc
@@ -0,0 +1 @@
+Add metrics to time how long it takes us to do backfill processing (`synapse_federation_backfill_processing_before_time_seconds`, `synapse_federation_backfill_processing_after_time_seconds`).
diff --git a/synapse/handlers/federation.py b/synapse/handlers/federation.py
index a09eaa437946..e15196205551 100644
--- a/synapse/handlers/federation.py
+++ b/synapse/handlers/federation.py
@@ -86,9 +86,14 @@
     "sec",
     [],
     buckets=(
+        0.1,
+        0.5,
         1.0,
+        2.5,
         5.0,
+        7.5,
         10.0,
+        15.0,
         20.0,
         30.0,
         40.0,
@@ -482,7 +487,7 @@ async def try_backfill(domains: List[str]) -> bool:
 
         processing_end_time = self.clock.time_msec()
         backfill_processing_before_timer.observe(
-            (processing_start_time - processing_end_time) / 1000
+            (processing_end_time - processing_start_time) / 1000
         )
 
         success = await try_backfill(likely_domains)
diff --git a/synapse/handlers/federation_event.py b/synapse/handlers/federation_event.py
index 32326975a187..048c4111f635 100644
--- a/synapse/handlers/federation_event.py
+++ b/synapse/handlers/federation_event.py
@@ -104,15 +104,25 @@
     "sec",
     [],
     buckets=(
+        0.1,
+        0.25,
+        0.5,
         1.0,
+        2.5,
         5.0,
+        7.5,
         10.0,
+        15.0,
         20.0,
+        25.0,
         30.0,
         40.0,
+        50.0,
         60.0,
         80.0,
+        100.0,
         120.0,
+        150.0,
         180.0,
         "+Inf",
     ),
diff --git a/synapse/rest/client/room.py b/synapse/rest/client/room.py
index 0eafbae45733..3259de480283 100644
--- a/synapse/rest/client/room.py
+++ b/synapse/rest/client/room.py
@@ -116,9 +116,13 @@ def from_member_count(member_count: int) -> "_RoomSize":
         2.5,
         5.0,
         10.0,
+        20.0,
         30.0,
         60.0,
+        80.0,
+        100.0,
         120.0,
+        150.0,
         180.0,
         "+Inf",
     ),
@@ -674,7 +678,7 @@ async def on_GET(
         room_member_count = await make_deferred_yieldable(room_member_count_deferred)
         messsages_response_timer.labels(
             room_size=_RoomSize.from_member_count(room_member_count)
-        ).observe((processing_start_time - processing_end_time) / 1000)
+        ).observe((processing_end_time - processing_start_time) / 1000)
 
         return 200, msgs