No this is not the umpteenth thread on how many minutes will on each side of a record, I've been preparing pre-masters for lps for some years already. However this time I've stumbled on a big difference in playing times of each side. I know the playing sides should be as close to each other as possible, as I've understood this causes a difference in volume. And it would be strange to have one side some dB louder than the other. This concerns a mlp with a total playing time of 30 minutes. Arranging the tracks in the most equal way, the sides are still A 18:18 / B 12:33. So that's 6 minutes difference at a total playing time of 30 minutes, or at 18 minutes on the longest side - that's 1/3rd. That seems a lot to me?! So my questions: how significant in the difference in volume at 6 minutes difference, or 1 minute, or x minutes @ 30 minutes total playing time? Is there a rule of thumb or so for this? Perhaps it's even so small, humans can't even hear it? Or can the volume be adjusted during mastering by the cutter? Thanks.