I have about 175GB of music, but a lot of that is flac. If I were putting it on my phone, considering its DAC and the fact I'm probably using bluetooth headphones I wouldn't hesitate to make all that 96kbit Opus instead and have no recognizable quality loss.

In my experiments in the past I was shrinking 80GB to about 15GB.

So if anyone has a huge music collection, you can still probably fit it on your phone without going crazy on the sd card. Just checking my collection is 2 months uninterrupted runtime right now.