Oh dear.
You will be fine.
Maybe, if you're really lucky, he will leave early lol.
Ok. I do them like once every couple of months. When the guy is fun time flies by and you don't even notice it, really. It's just sex, chat, offer a shower together maybe, throw in a bit of massage.
I always have something like grapes or strawberries ready (that's because fuck me i get hungry lol) and they really appreciate it.
Worst types are guys who don't talk. That's just mentally draining. I never understood why they book that long. Or guys who just talk about themselves.
If it comes to the worst you can always cut it short to 2 hours. I did it once and offered refund for the rest of the time. Some guys have eyes bigger than stomach so they don't realise at all how long 3 hours is. Good luck xxx