I bought a double mattress just for my self and let it rest for more than 24 hours before using to ensure full inflation and the mattress was as I expected. As a side note unfortunately, but probably it's common amongst foam mattresses I have slept on, after two nights I switched side of sleep because I fell the mattress was getting too soft, making it more 'concave' and less comfortable. After a month of sleeping it is still ok for me but I hope it doesn't get too soft in a couple of months. Having said that, I feel that maybe I could have gone for a cheaper solution.