How fast/slow should I allow a large print to cool?

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What I’m using running the bed at 95 during printing

M140 S85 ; SET BED TEMP TO 85
G4 S750 ; WAIT 12.5 MINUTES OR 750 SECONDS
M140 S75 ; REPEAT
G4 S750
M140 S65
G4 S750
M140 S0
G4 S750