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On my 12" dob to ambient ( 10-13C diff in temp):
No fan - Never (more than 45 mins)
Fan - 18-25 mins.
On my 8" Mak:
No Fan - Never
Fan - 20-25 Minutes.
If left outside the dob (open tube) will hit ambient w/o a fan in about an hour to an hour and a half. The Mak about 2 hours.
My experience only, YMMV, but for the extremely low current drain and limited noise, its hard to see the value in NOT having a fan.
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