Took the full 72 hours to inflate. The corners looked damaged.  I read about the mattress and what to do if that happens. If you role in the corners toward the middle and hold it there and do it a few times it then will pop up the corners.  I am on my second night sleeping on the mattress. It is very comfortable. I was very apprehensive about this purchase.  All worked out very well! Good find, great buy…. Recommend