Mattress was delivered to the house about 4 days after purchasing. The packaging claims it takes 48 to up to 72 hours to fully come back to regular size. I'd say it took about a week. All in all the mattress is what the website claimed to be. Very comfortable! Had it for a bout a month now and its the best sleep I've had in a long time. There is a light odor that comes from the foam but if you lay the bed flat and let it reshape, the scent goes away. I have actually recommended this to a friend. My roommate got to sleep on it for a night or two and she went and bought the same mattress for a full sized bed!