not always though. not sure what causes it.

i DO know that back when my CPU was running hot... maybe 50*C+ idle/bios... it took FOREVER. for some reason better cooling speeds it up. also waiting before going in there helps too. like, if its the first thing you do superspeedyfast then youll have to wait, but not if you do other stuff in the meantime

considering these two things it is probably just verifying temps and whatnot, which is why higher temperatures may take it longer?