I just started my Invisalign 1 week ago and so far I am really struggling to keep them on for 22 hours. I would say I average between 20-21 hours. My 2nd day it hurt so bad and was so uncomfortable that I only had it on for 17 hours. I like to have 3 meals per day, so by the time I eat and brush my teeth (at work) it takes me an hour per meal, with coffee even more For people who work full time and go out to eat with friends or have dinner socially , how on earth are you sticking to 22 hours?