I was told various electron ports are blacklisted on builders because they take way too many hours to complete. There is a scheduler bug which is the likely culprit and it is fixed with this: https://people.freebsd.org/~mjg/ule_pickshort.diff Thus the test would be un-blacklist said ports and do a full bulk build, then check their times.
correction, try this instead please :) https://people.freebsd.org/~mjg/ule_pickshortv2.diff
hold it if you have not started yet, there are unrelated patches which will be useful to apply
(In reply to Mateusz Guzik from comment #0) for electron ports, it's not just a problem of timeout, it's also a problem of disk/memory usage.