Allswell doesn’t require customers to unbox the mattress within a specific time frame, but you should do it as soon as possible.

Leaving your new mattress in its original packaging for too long can affect its ability to fully expand, resulting in diminished performance and durability. Plus, you should unbox and place the mattress in a well-ventilated room shortly after purchase to reduce off-gassing.
In general, it’s a best practice to unbox your new mattress within 30 days of arrival.