Not sure there is a limit, i used an interior ambience mod a while back that had a 30min mp3 track looping to provide the background noise inside the sub.
+As for filesizes you can get away with dropping the quality massively, no need for 320kbps stuff here, 128 or even 64 will do just fine as with all the other background noises you`ll never hear the difference anyway.
If in doubt id say try it and see, maybe grab a few beta testers to check it out on various systems to be sure it doesnt cause problems.
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