1-2 weeks, around there. What I actually TRY to do is FIM, and get more than two tops. Sometimes I succeed, sometimes not. Seems like there's just some luck involved there, but I always get at least two tops. The most I've ever gotten right off the bat is five, although I've heard of people getting eight.

You can top the topped tops too, and do it again, and get up to eight that way. Obviously, that really slows things down for a while. I've never tried to get more than eight tops; I start getting impatient. I don't even know if you can get more than eight. I've read that most strains have a genetic maximum of around 32 total growth shoots, but obviously those can't ALL be tops.

BTW, you can prune ALL the growth shoots, not just the tops. That's what I do. I top (or FIM), then prune half the other growth shoots too. After a week of recovery time I go and prune the half I didn't prune the previous week. (Plants probably wouldn't like it if you pruned down ALL the growth shoots at once.) After that, they get pretty bushy and hard to work with, so I just leave it at that.