HOME SETUP TIMER
How long does a compressed mattress take to fully expand?
Quick answer
Use 24 hours–72 hours as the starting point.
After unboxing
Start a reminder timer
24 hours
Timer has not started.
When it rings: Check the corners and measured height rather than time alone.
What the source actually says
Purple says most compressed or rolled mattresses can take 24 to 72 hours to fully expand.
The manufacturer instructions for the exact mattress take priority.
Source
Read the manufacturer guidance. Model instructions override this general page.