I’ll chime in. I started learning to draw in my early twenties, couple hours a week. What helps a lot is joining a club, I’ve got a group in my town that just goes to a bar one night a week and draws and chats for 3 hours. Great way to ensure that you get at least a few hours of drawing in, even if your week is too busy for “practice”.

It takes about 2-3 years of mild practice to get good enough that you’ll routinely impress yourself, about 5 years to get good enough that you could do paid commissions.

Seems like a long time, but unless you start in your seventies you’ll have decades left of enjoying being an artist afterwards.