diff --git a/4chan_x.user.js b/4chan_x.user.js
index 75474c209..fc0916eea 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -1620,10 +1620,10 @@
       content = $('textarea', qr.el).value || $('input[type=file]', qr.el).files.length;
       if (!content) return 'Error: No text entered.';
       /*
-          captchas expire after 5 hours (emperically verified). cutoff 5 minutes
+          captchas expire after 30 minutes (emperically verified). cutoff 5 minutes
           before then, b/c posting takes time.
       */
-      cutoff = Date.now() - 5 * HOUR + 5 * MINUTE;
+      cutoff = Date.now() - 25 * MINUTE;
       captchas = $.get('captchas', []);
       while (captcha = captchas.shift()) {
         if (captcha.time > cutoff) break;
diff --git a/changelog b/changelog
index 8193a1627..a63d81432 100644
--- a/changelog
+++ b/changelog
@@ -1,4 +1,6 @@
 master
+- aeosynth
+  update the captcha caching expiration date to 30mins
 
 2.22.2
 - mayhem
diff --git a/script.coffee b/script.coffee
index c01cc134d..863d8646c 100644
--- a/script.coffee
+++ b/script.coffee
@@ -1255,11 +1255,11 @@ qr =
     return 'Error: No text entered.' unless content
 
     ###
-    captchas expire after 5 hours (emperically verified). cutoff 5 minutes
+    captchas expire after 30 minutes (emperically verified). cutoff 5 minutes
     before then, b/c posting takes time.
     ###
 
-    cutoff = Date.now() - 5*HOUR + 5*MINUTE
+    cutoff = Date.now() - 25*MINUTE
     captchas = $.get 'captchas', []
     while captcha = captchas.shift()
       if captcha.time > cutoff