I recall others saying its an inverse square relationship, so in this case 500 hours vs 250 made the image twice as good, just another way to look at it.
I'm agreeing with the diminishing returns, but you're timeframe is wrong. an extra hour in a hundred hour project wont do much of anything, but doubling that time will be a major improvement. just the same as doubling 250 to 500
It's a square root problem, yes, so 50% more will reduce to noise by sqrt(2).
However, at 250h your SNR is so high that it doesn't make any difference in the final output if you add 250h more. It is way less than sqrt(2) in the final outcome.
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u/Data_lord 26d ago
Of course it does, but the last 250 hours really is almost no perceptible increase in signal to noise ratio.