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I can usually get a window of 30 minutes or so before I have to switch the cooling back on - so the cooling runs from sunset when I set up until 2am or whenever, then I switch it off and let it sit for about 30 minutes, after that I get about 30 minutes to an hour of useful time before I see the image starting to break up again as the boundary layer comes back. Then it's time to turn the cooling back on and go inside for a cuppa :-)
I've got a computer that watches these temps and switches the cooling off if the mirror reaches ambient. That way I dont have to babysit it too much, except making sure I don't get ice on the primary in winter ..
Bird
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