HOME SETUP TIMER
How long before contacting support about slow mattress expansion?
Quick answer
Use 72 hours as the starting point.
After unboxing
Start a reminder timer
72 hours
Timer has not started.
When it rings: Compare the mattress with its stated dimensions and manufacturer guidance.
What the source actually says
Purple says expansion may take as long as 72 hours for many compressed mattresses.
Contact the maker of your exact mattress if it remains misshapen.
Source
Read the manufacturer guidance. Model instructions override this general page.