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I collimate every time I take the scope out - at the beginning of the session.
And for imaging, I usually re-collimate when the scope changes where it's pointing significantly. So i'll collimate at the beginning when it's pointing lower, then check/correct collimation when it's pointing near to straight up. Sometimes it doesn't need any adjustment, sometimes it needs a tweak. The mirror can shift slightly as the scope moves around the sky, so when you're after the best resolution to get the best images, it's worth checking and re-checking collimation as often as you can spare the time for it.
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