Also depends on the size of the head they are using, I've done most of my body at this point, but started with face and neck 3 or 4 years ago. Feels like they've done those areas in no more than 15 minutes total laser time, if that. 2 minutes might be a little short, but it can go pretty fast if you don't slow them down. Might have been faster if I wasn't so chatty. I can say that in my case, laser was very successful, I have just a few random dark hairs now, just the pesky white ones left behind, which are bound for electrolysis when I get Kaiser to sign me up.
They did the sides and neck very quickly with the large laser head, then switched to a smaller ball sized head with gel to go over the upper lip and chin. Fun!