An MP3 is about 1-2 meg/minute depending on bit rate, so in the worst case, say 4-8 million minutes depending on bit rate, so it's about 66,666 to 123,000 hours depending on file size. About 7.6 - 15 years of continuous recording. Chances are, unless you're loading it with porn (and maybe not even then!) you probably can't fill this before it wears out. Trust me, by the time you even come close to filling this drive, a 40TB drive will be about the same price, you'll buy that, then copy everything over, format it, then offer it to your kid, who will wonder what can he do with a drive this small.