Reduce luci timeout to 41.

Change-Id: I1e4cbac48afacbd438ee7a9ef5a623bc448443a7
diff --git a/tools/luci/config/cr-buildbucket.cfg b/tools/luci/config/cr-buildbucket.cfg
index cc1efb2..d8da12f 100644
--- a/tools/luci/config/cr-buildbucket.cfg
+++ b/tools/luci/config/cr-buildbucket.cfg
@@ -33,7 +33,7 @@
     builder_defaults {
       dimensions: "pool:luci.art.ci"
       service_account: "art-ci-builder@chops-service-accounts.iam.gserviceaccount.com"
-      execution_timeout_secs: 158400  # 44h
+      execution_timeout_secs: 147600  # 41h
       swarming_tags: "vpython:native-python-wrapper"
       build_numbers: YES
       # Some builders require specific hardware, so we make the assignment in bots.cfg