How long does a foster child stay with you?

I read that the average stay in foster care in Texas is 25 months. However, I've had 4 placements, a total of 11 kids, and that hasn't been our experience. We haven't had anyone for longer than 3 months. C was with us 1 month. Sibs B,D,and V were with us for a month, their little sister Queenie was with us for 3 months. That was a case where S County wanted the kids housed in S County. The older kids left for hospitalization, the baby left to go back to her home county. Next were 4 lovely kiddos who were returned to grandma and aunt after 6 weeks. We currently have 2 sibs, Missy and Bubba, who are from a distant county. They've been with us for almost 3 weeks and we go to permanency hearing next week. I live in a primarily rural area of Texas and there aren't enough foster homes to be picky about county lines........unless you're from S County!