Hi, I am on to my second set of trays. I have them in for 22 hours a day, plus or minus 20 minutes. My breaks are between 20 and 40 minutes. What if I want a longer break for a social occasion ? I once did half hour breaks breakfast and lunch, then 3 hours for an occasion. When I put them back in they felt a bit tighter. The next day I was back to my 22 hour routine.