I have three, they live with me every other week, since I have had kids for 13 years now it is hard to imagine how it was without them, how it was with only one

I have three, they live with me every other week, since I have had kids for 13 years now it is hard to imagine how it was without them, how it was with only one or two of them. My oldest two helps taking care of my younger one sometimes. I also tend to let the younger one do more stuff earlier on than I let the other two do. On top of that, it is more or less impossible to fill 5 days with 8 hours work the weeks the kids are at my place, but age solves that, they can stay a bit longer at daycare, when they get to 8-9 they can walk home by themselves etc. Life is complex at times, but most of the time it is quite awesome. Weeks when I don't have the kids tend to be work and trying to get enough sleep to have the energy needed for a 100% week with my kids. Even if I dont do 8 hours every day the weeks I have the kids, I'd say it is more or less 100% responsibility from 6:30 AM to 11 PM.