Usually this step takes less than 1 minute. But occasionally, it takes a really long time, causing builds to time out. This causes flakiness issues with presubmits, sometimes turns the tree red when it fails on postsubmits, and sometimes causes failures in our autorollers.

Examples from the last day:

• Timed out after 58m
• Succeeded after 32m Build timed out because subsequent steps did not have enough time.
• Succeeded after 22m Build timed out because subsequent steps did not have enough time.
• Timed out after 56m
• Timed out after 55m
• Timed out after 54m

And a couple "typical" runs for comparison:

• Succeeded after 19s
• Succeeded after 26s