diff --git a/src/api/exercise_sessions.js b/src/api/exercise_sessions.js
index 650c3e707..96c7c9d29 100644
--- a/src/api/exercise_sessions.js
+++ b/src/api/exercise_sessions.js
@@ -21,7 +21,7 @@ Zeeguu_API.prototype.exerciseSessionUpdate = function (
 ) {
   let payload = {
     id: exerciseSessionId,
-    duration: currentDuration * 1000, // the API expects ms
+    duration: currentDuration, // the API expects seconds
   };
 
   // Use beacon to prevent "Failed to fetch" errors when user navigates away
@@ -34,7 +34,7 @@ Zeeguu_API.prototype.exerciseSessionEnd = function (
 ) {
   let payload = {
     id: exerciseSessionId,
-    duration: totalTime * 1000,
+    duration: totalTime, // the API expects seconds
   };
 
   // Use beacon to prevent "Failed to fetch" errors when user navigates away
diff --git a/src/api/reading_sessions.js b/src/api/reading_sessions.js
index 3b4280261..ed9899118 100644
--- a/src/api/reading_sessions.js
+++ b/src/api/reading_sessions.js
@@ -23,7 +23,7 @@ Zeeguu_API.prototype.readingSessionUpdate = function (
 ) {
   let payload = {
     id: readingSessionId,
-    duration: currentDuration * 1000, //the API expects ms
+    duration: currentDuration, // the API expects seconds
   };
 
   // Use beacon to prevent "Load failed" errors when user navigates away
@@ -36,7 +36,7 @@ Zeeguu_API.prototype.readingSessionEnd = function (
 ) {
   let payload = {
     id: readingSessionId,
-    duration: totalTime * 1000,
+    duration: totalTime, // the API expects seconds
   };
 
   // Use beacon to prevent "Load failed" errors when user navigates away
diff --git a/src/words/SessionHistory.js b/src/words/SessionHistory.js
index 1fd798491..b5b57b0d9 100644
--- a/src/words/SessionHistory.js
+++ b/src/words/SessionHistory.js
@@ -388,9 +388,9 @@ function formatTime(isoString) {
   return date.toLocaleTimeString([], { hour: "2-digit", minute: "2-digit" });
 }
 
-function formatDurationShort(ms) {
-  if (!ms) return "0 min";
-  const minutes = Math.round(ms / 60000);
+function formatDurationShort(seconds) {
+  if (!seconds) return "0 min";
+  const minutes = Math.round(seconds / 60);
   if (minutes < 60) return `${minutes} min`;
   const hours = Math.floor(minutes / 60);
   const remainingMins = minutes % 60;