I'm a single mother and work 30-40 hours a week. When ds was younger I worked less, worked weekend evenings with babysitters and an overnight daycare. Now that ds is 13, I've taken a job managing a restaurant with very irregular hours. I spend a lot more time planning than I used to. I've found that unschooling doesn't really work well when I'm not home as much, and I have to really plan out meals and my time, so I don't waste time I could be spending with ds. It's not the ideal situation, but we're both really happy not to be totally poor anymore. Lentil soup and free shows in the park get a little wearing after 10 years or so, lol. The trade off is less time and a somewhat more structured lifestyle, but we both think it's worth it right now.
You don't necessarily have to homeschool during "school" hours, either. When ds was younger we did most of more meaningful work in the evening, when we are both much more alert and enthusiastic (neither of us are morning people), and daytime was mostly for field trips and museums, and going out for long, leisurely lunches.
My 1st choice would always to be at home with ds all the time, but that has just never been possible, and working has had some benefits for us as a family (besides the money), in that ds is much more independent and self-possessed and confident than most other 13yo's that I know, because he's had to try to figure stuff out for himself (like what to do when the toilet overflows and mom isn't home!) He knows how to buy groceries for himself, how to make meals for himself, he has a tremendous amount of confidence in himself, and is constantly amazed by how much his friends don't know about what he thinks are basic things, like taking care of money, fixing household items, making himself a meal (and even more amazed at how many of our *adult* neighbors will ask him for help with fixing toilets or putting up shelves because they don't know how to use tools, measure accurately, and think their way through a problem).