HOME SETUP TIMER
How long should a Casper One mattress expand?
Quick answer
Use 24 hours as the starting point.
After unboxing
Start a reminder timer
24 hours
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When it rings: Check that the mattress has reached an even shape before evaluating it.
What the source actually says
Casper recommends giving the Casper One at least 24 hours to expand.
Follow current instructions supplied with the mattress.
Source
Read the manufacturer guidance. Model instructions override this general page.