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Daniel
An 8" will cool down relatively quickly, I usually just left my 8" outside for about 1/2 an hour unless there was a large temp difference between inside and outside. If your scope has a fan that will speed up the process.
Taking of the dust caps will also speed things along. As for bugs getting in, they will get in anyway when you use the scope, so I wouldn't spend any time worrying about the cool down time. Leave the tube horizontal so the mirror is vertical reduces the risk of any dust or dirt settling on the mirror.
Malcolm
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