Bought for the guest room it has not inflated to 12 inches,  after two days just barely at 11 inches.   Seems comfortable though so I am happy with it I couldn’t beat the price.  Box was a bit torn up when it arrived but mattress was in good shape and easy to unwrap with a tool they gave you so you wouldn’t cut the mattress by accident with a sharp object.  Has a 10 year warranty too.