Merge #15349: travis: Only exit early if compilation took longer than 30 min

fa1db331de travis: Only exit early if compilation took longer than 30 min (MarcoFalke)

Pull request description:

  As opposed to 25 minutes, which hits quite often when a header changes or the pull request cache is outdated.

Tree-SHA512: 3d585e6441a4e5620eb30cf31dc7219fabe3fe2adb53c485339ed9d627a40307af1b0aa2bf73353322932952d92444e29cdef21914da166f20eab7a288a75df5

.travis.yml

@@ -33,7 +33,7 @@ before_script:
   - set -o errexit; source .travis/test_05_before_script.sh
 script:
   - if [ $SECONDS -gt 1200 ]; then set +o errexit; echo "Travis early exit to cache current state"; false; else set -o errexit; source .travis/test_06_script_a.sh; fi
-  - if [ $SECONDS -gt 1500 ]; then set +o errexit; echo "Travis early exit to cache current state"; false; else set -o errexit; source .travis/test_06_script_b.sh; fi
+  - if [ $SECONDS -gt 1800 ]; then set +o errexit; echo "Travis early exit to cache current state"; false; else set -o errexit; source .travis/test_06_script_b.sh; fi
 after_script:
   - echo $TRAVIS_COMMIT_RANGE
   - echo $TRAVIS_COMMIT_LOG