(PhD and math professor here) What do you want out of your PhD? If you want the initials after your name then great, but the only way to juggle a full time job

(PhD and math professor here) What do you want out of your PhD? If you want the initials after your name then great, but the only way to juggle a full time job with PhD (which itself is a full time job) is to half-ass both. Maybe this suits your goals, but I find this difficult to imagine. Are you in a position where a mediocre PhD, with a weak recommendation from your thesis advisor, would actually do something for you? Personally, as an advisor I wouldn't even take a student with a full time job, let alone side hustles in addition. I'd assume they'd have too little time and energy to accomplish anything. And are you even able to attend seminars, go to conferences, etc. etc. which are a normal part of graduate work? I definitely agree that it's worthwhile to maintain physical fitness and at least something of a social life no matter what. Beyond that, I'd agree with what everyone else is saying: choose what is most important to you, and focus on that more narrowly.