We just got to use it today for the first time. We love it, heated up nice, stay up to heat well. It only dropped 2 degrees while we were in it for 2 hours today. Took about 28 hours to get up to 104. It about 2 hours to full. It was delivered Friday night and it’s Sunday and we are using it and loving it. So far great purchase. This is our second inflatable hot tub. If you are debating on it, don’t  just buy it. You will be very happy.