How Many Households are in Your Rotation?

My current game requires all the families or households that are important to the story is at least somewhere between eleven (I know it's more than that) and closer to twenty. I might have to count them. But will add this is just to start, doesn't include if I will allow them to have more kids and or add more kids or let those kids have kids. One time I had over one hundred but that game had gone on for years and years. ETA: But forgot to add I also play many different hoods and terrains. Like in one there is the gothic/victorian age, another it's the 60's another it's a western theme with a bunch of households as ranchers, and in another it's space etc. I never can play just one household I would cry my eyes out. I have to have a lot of households to make that town's story real to me.