As of may 7 2020 we have let the mattress fully expand for 72 hours as recommended it inflated 90% within the first hour. I was very skeptical about buying a mattress In a box. Also skeptical about a memory foam mattress. My 5 star is real I have absolutely zero complaints. It does have a mild smell for the first 24hours but is not enough to deter a purchase. If you are searching for a mattress I highly recommend this. The price is low which can also be scary as you get what you pay for but I am telling anyone that you will be impressed. We bought the full. I will update my review as time goes on.