diff --git a/CHANGELOG.md b/CHANGELOG.md
index 49d11bda1..4e7bc0aed 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@
 - Add support for string errors in error reporter ([#2464](https://github.com/getsentry/sentry-ruby/pull/2464))
 - Reset trace_id and add root transaction for sidekiq-cron [#2446](https://github.com/getsentry/sentry-ruby/pull/2446)
 - Add support for Excon HTTP client instrumentation ([#2383](https://github.com/getsentry/sentry-ruby/pull/2383))
+- Improve the accuracy of duration calculations in cron jobs monitoring ([#2471](https://github.com/getsentry/sentry-ruby/pull/2471))
 
     Note: MemoryStore and FileStore require Rails 8.0+
 
diff --git a/sentry-ruby/lib/sentry/cron/monitor_check_ins.rb b/sentry-ruby/lib/sentry/cron/monitor_check_ins.rb
index 835ae84ad..314733cfb 100644
--- a/sentry-ruby/lib/sentry/cron/monitor_check_ins.rb
+++ b/sentry-ruby/lib/sentry/cron/monitor_check_ins.rb
@@ -14,12 +14,12 @@ def perform(*args, **opts)
                                                 :in_progress,
                                                 monitor_config: monitor_config)
 
-          start = Sentry.utc_now.to_i
+          start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
 
           begin
             # need to do this on ruby <= 2.6 sadly
             ret = method(:perform).super_method.arity == 0 ? super() : super
-            duration = Sentry.utc_now.to_i - start
+            duration = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
 
             Sentry.capture_check_in(slug,
                                     :ok,
@@ -29,7 +29,7 @@ def perform(*args, **opts)
 
             ret
           rescue Exception
-            duration = Sentry.utc_now.to_i - start
+            duration = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start
 
             Sentry.capture_check_in(slug,
                                     :error,