Our collective artistic mythology holds that a true artist is one who devotes all of his time to the craft - it's part of the unspoken bias that if you work at it part-time you are only partly invested.
I get frequent questions from artists who wonder how they can have an art career when they need to work, and don't have the finances to work on their art full time. We know it takes time to learn the various skills needed - it isn't something you can just drop in and do on an infrequent basis and expect great results. And if there weren't really good reasons to learn and practice and "just do it" there wouldn't be so many successful artists coming out of a strong foundational educational background.
But it's safer for someone afraid of testing their wings to focus on what might be preventing them - like the kid who finally makes it to the top of the high dive and then can't jump off because the water is too wet. It's a like holding out for perfect when perfect doesn't exist.
Having experienced this - from working full time, then part time, then completely unemployed/semi-retired, to needing to return to part time work, - perfect is what you have, not what you think it should be.
Yes, there will be days when you're too tired to try. Days when your frustration levels make you feel like you're pushing rocks uphill.
But these frustrations occur whether or not you have the time - because it isn't the amount of time you have that makes the difference.
It's whether or not you are willing to commit to the time you find.
For some reason finding time changes the way you look at what you have in front of you. It's a gift you are giving to yourself and your art.
Where as having time is more like an excuse not to take out the trash.