If you can keep your newt out in a locked uninsulated shed (under a sheet maybe? and out of direct sunlight) - and not be worried about it that is - then it will be stabilised already, generally speaking. Mine only takes so long to cool down coz i am a woz
and cant stand to think of my scopes getting pinched or being lonely, so they are kept inside (not that i use them as much as i used too) - my 8" dob has an 9" oversized tube with clearance - which helps a bit as the air can move thru pretty quick - that only takes 30 min to cool down - even less sometimes - whereas my ten takes about two hours from coming from inside. Putting it out early, as was said, is the go as well.
Dont forget to point a dob?/newt straight up for at a half an hour at first to really get it cooling - just said that on the very slight chance you werent already doing it that way. You know roughly when its settled by doing a rough airy disc and looking for tube currents on the edge of airy disc corressponding to the inside of tube.
Cheers
Fringey