One-on-one time with my kids

As particularly the older ones in my family are becoming more independent and coming into their own, I feel like I need to have a new strategy for one-on-one time with them. But I have so many kids, this is often simply impractical. How are other parents doing it and any thoughts on how much time each needs in terms of solo time with parents (or even 1 parent, which in my case is probably more realistic since my husband and I have to divide and conquer)