Hi there. First of all, as a mom and a business owner I totally share your conerns- but let me share my perspective as the child of an entrepreneur mom and professor dad:
My mom worked incredibly long hours growing up. My grandmother was home with us most of the time, but she couldn't speak English or drive. She did cook, but she was pretty abusive toward me. But my mom knew we were safe in the sense that there was an adult most of the time.
As we got a little older, we took the bus home and were home alone until our folks came back. We lived far from town, so it was dinnertime by the time they came back.
When they had a restaurant (on top of other small businesses they ran) we worked with them. I waited tables and started saving for college when I was 13. We learned the ins and outs of the business, like it or not.
We turned out FINE. My brother is happily married with a very very well paying job, two kids, the good life. I'm an artist and a business owner (who spends A LOT more time with my kids.) I teach part time at my daughter's school, too, just to be home with her.
My mom's work showed me that I can do anything I want to, just like she did. By working hard, she taught me work ethic and it shows in everything I do. People notice it about me. I notice that among all the people I know, I am the most likely to follow my interests. I have a sense of confidence that a lot of my friends lack. I get that from following her example.
My mom working was a gift. She struggled with it, but we never got in trouble, we made good grades (at least in college), we have great families, jobs, lives. We're blessed. I can't imagine who I'd be if my mom felt so limited by us that she never did all those things and never served as an example of hard work. I'm grateful that she sacrificed time with us to show us how to live.
I struggle with the question, too. I try to find balance. I wish you all the best.