i'm sure others are like you and schedule an hour or less if they can. but for a first time i generally choose 1.5-2.0 hours in order for me to have time to get comfortable.

problem is that half the time there is something that would not normally appear in a review that really puts me off. i'm picky to a fault. i don't review those ladies and don't rebook. 50% success only.

otherwise, on the very rare occasion when i can meet a girl face to face for 5 minutes or less i can always tell whether its going to be a good time or not.