I have had a look at my sub library, and based on duration, I reckon there is over 500 hours; and that is not counting discards which have been deleted. However, much of that is acquired by my observatory system while I have been asleep. Not sure how much processing time has been spent, as that is more difficult to track.
I have thought that astro cameras should have a built-in hour meter, like marine engines. It would not be hard to add a software hour meter to an app like SGP for each of the cameras used. DSLRs have a shutter count (well some do) but that is useless as a contribution to duration.
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