i stick with 600 x 900 for covers
2 reasons, 1) time i spend per day actually looking at full screen covers on my Kobo is a few seconds per day, max
2) i know that 600 x 900 is also accepted by all Kindles, I prefer a one size fits all approach
( there's also the extra Hard drive space needed to store a few thousand larger covers, but that's minimal, as a % of modern drive capacities
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