Having screwwed up my permissions by trying to have two users accessing one home folder I'm now going through the process of reseting my main user home permissions via the OSX install disk utilities, which seems to be taking a while.

Does this process take a while to do, though I assume it depends on how many files I have in the folder, which in my case is a good few 100 GBs.

At what point should I be concerned that it may have got stuck and thus reset my computer and try again?

I assume, though not sure that if the little circle indicator is still moving then it's not completely frozen, but as there's no progress bar or details I'm not sure how true that is.