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My understanding is that Mak-Cass mirror size is less of an issue for cooling than the thick corrector plate of the objective. However, catadioptric scopes are sealed systems, so heat escape/transfer is always relatively slow and the mirror is well buried inside them.
In my experience with an ETX-125, cool-down is likely to take around 45-60 minutes, depending on the difference between storage and ambient temperatures.
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