When my RAH and I were separated I made a life for me and that included my kids going over to his place every other weekend. That gave me a time to plan for myself and I didn't have to get into accommodating his schedule so he could see his kids.
Of course, safety was first and we had some weekends where he didn't get to see them.
My DS is 10 and DDs are 14 and 17. It was mainly my 10yo and sometime 14yo that would spend time with their dad.
Even now that he is not actively drinking and living with us I stick with the every other weekend where I am the designated parent one weekend and he is the next. This way if we don't have any plans to do something together I plan some time for myself or with some other friends.
I often wonder if it's such a "business type" of arrangement in normal relationships. I don't see it working any other way with my RAH and me.