diff --git a/runbot/runbot.py b/runbot/runbot.py
index cf8c8b6d..f544577b 100644
--- a/runbot/runbot.py
+++ b/runbot/runbot.py
@@ -735,7 +735,7 @@ class runbot_build(osv.osv):
                 lock_path = build.path('logs', '%s.lock' % build.job)
                 if locked(lock_path):
                     # kill if overpassed
-                    if build.job != jobs[-1] and build.job_time > 2400:
+                    if build.job != jobs[-1] and build.job_time > 1800:
                         build.logger('%s time exceded (%ss)', build.job, build.job_time)
                         build.kill()
                     continue