Hi, @kmcaloon. I think this support guide might have more information about the root cause:
To summarize, some subprocess isn’t existing which then causes the build system to wait until it does. This doesn’t ever happen to the build is manually timed out after 15 minutes.
If this is the root cause, the solution is to make sure that subprocess exits and returns control to the build system.
If this doesn’t work or if there are other questions, please let us know.