My wedding is at 1 pm, and I am not having pictures taken before the ceremony, so my hair/make-up appt is set for 11 am at the resort's spa. So, I would say that you're OK starting by 4 pm. I'd personally like more than 2 hours to do everything - hair, make-up, getting dressed, get to the altar, but I do understand that the resort does have at least 1 wedding earlier than mine, and that bride probably has a hair/make-up appt too. Plus, that's less time for me to totally mess up what they put together for me!