If you ever want to chat about getting a PhD, happy to discuss my experiences. I have no regrets re: getting mine (started when I was 28), but it’s a really long road (for me, 6 years total, full-time, which is typical in my field, though the range for most is probably 5-8). I think it’s only worth it financially if your program is fully funded with a decent stipend (which at least in the US, many are, via teaching/research assistantships and other such things—I know funding in Canada works differently though, via federal fellowships etc), but even then, depends on your goals etc. Also, in my program and many others, you aren’t really allowed to do them part-time, though some people illicitly moonlight on the side. These days I do somewhat discourage people from getting a PhD where the only real use for it is academia, since that’s such a mess of a job market, but for ones with more practical applications, it can be different.
As someone working in academic medicine, I’m constantly learning in my field, which is part of what I love about my job. I miss having more hobbies and creative outlets and learning in those ways though, which dropped off the wayside for me largely starting with grad school. I’ve been saying for years now I’m going to prioritize them again, but shrug. It’s challenging.