What happens if I wear my Invisalign tray for 30 minutes less a day? (Photo)

I've been very good with wearing my Invisalign trays for 22 hours a day. I'm on my first tray out of 21 total trays and I have to wear them each for 2 weeks. Yesterday I wore it for abit less than 22 hours. I wore for 21.5 hours so half an hour less. Would it affect the treatment if I did that occasionally (say 6 times in that fortnight) so it's only a total 3 hours less altogether for that tray? Or does it have to be exact but the minute.