Well, I have done it several times since then. All clean ./launcher rebuild app without prior failures.
Run on multiple VM’s with the same sizes, RAM and CPU’s.
Sometimes the chown complete within seconds. Sometimes the chown takes forever. And the larger installations may be the fast ones.
I’ll experiment some more…
BTW… it may have something to do with running ./launcher cleanup prior. It seems that chown runs very fast after a cleanup, but need more evidences.
EDIT: My VM’s all have 2 CPU’s, 3GB RAM and HDD (not SSD). So this may magnify the impacts of chown a bit.