Timeouts on branch_10x checks

Hi all,

I was back-porting a change [1] to 10x recently and noticed one of the
checks timed out after 30 minutes. It passed on retry.
Looking at other commits on that branch [2], I see the timeouts happen
often and I also see checks succeeding close to the timeout, e.g. after 27
or 29 minutes. I also see that similar-looking checks succeed more quickly
on the main branch [3].

Does anyone understand what's happening with the slow runs?

Stefan

[1]
https://github.com/apache/lucene/commit/327c517253ede5daccf7366b6720c5ce181e3f2c
[2] https://github.com/apache/lucene/commits/branch_10x
[3] https://github.com/apache/lucene/commits/main