How long do I have to leave the mattress to expand until sleeping on it?

It will take up to 4 hours for the mattress to reach its usable size once unpacked and unwrapped.

Occasionally, it can take a few days to reach its full comfort and size and the corners can be the last parts to fully expand.

If you are unsure whether the mattress is fully expanded, you can measure the depth around the un-expanded area. It should be 25cm with 2cm difference leeway either way.