diff --git a/dev-support/Jenkinsfile b/dev-support/Jenkinsfile
index 0abb3664e40..ff096e34de9 100644
--- a/dev-support/Jenkinsfile
+++ b/dev-support/Jenkinsfile
@@ -21,7 +21,7 @@ pipeline {
     }
   }
   triggers {
-    cron('H */6 * * *')  // Run every 6 hours.
+    cron('H */12 * * *')  // Run every 12 hours. See https://jenkins.io/doc/book/pipeline/syntax/#cron-syntax
   }
   options {
     buildDiscarder(logRotator(numToKeepStr: '30'))
diff --git a/dev-support/flaky-tests/run-flaky-tests.Jenkinsfile b/dev-support/flaky-tests/run-flaky-tests.Jenkinsfile
index 341d45c4987..642ccd2ab4e 100644
--- a/dev-support/flaky-tests/run-flaky-tests.Jenkinsfile
+++ b/dev-support/flaky-tests/run-flaky-tests.Jenkinsfile
@@ -21,7 +21,7 @@ pipeline {
     }
   }
   triggers {
-    cron('@hourly')
+    cron('H */4 * * *') // Every four hours. See https://jenkins.io/doc/book/pipeline/syntax/#cron-syntax
   }
   options {
     // this should roughly match how long we tell the flaky dashboard to look at