Everything is correct, 2700" is the total integration time.
But you have written 68x2700, which makes it seem like 68 frames of 45 minutes each, totaling 51 hours.
If you had 68 frames with a total exposure of 45 minutes, you should have written 68x40"
That is, 68 frames of 40 seconds each, which would add up to exactly 45 minutes ;)
Comments
It looks more like 51 minutes, is there a mistake in the description?
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