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It depends on the density of the foam and the temperature of the room. Most cheaper memory foam mattresses are 2.5-3.75 lbs per square foot. These can take several hours to roll out to their full size, less in hot weather, more in cold. A Tempurpedic quality mattress (5.25 lb) should take 10-30 minutes depending on temperature.

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Q: How long does it take a memory foam mattress to inflate that has been in the box 2 years?
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Can you put a mattress pad over a memory foam mattress?

Yes, but it will sleep hot! Having a pad over a good memory foam mattress defeats the purpose of buying a good mattress set. You can use a mattress protector that has been specially made to dissipate the heat see your local mattress store for the paper thin protector.


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