15-20, I think. I like the idea of multiple use discounts.
Honestly, it very much depends on location, city, location of our home, special circumstances (dogs are super shy, super reactive, pull like freight trains) but this is the average I would spend (and is the range I get paid)
I'm a dog walker and that's about average for the city for 20 minutes-30 minutes. There are also discounts of course for those on the "regular schedule" (monday-friday) and those with multiple dogs in the same home.
and of course there are discounts for those who just want potty breaks. Those are 10 minutes long about and it's just walking them to "their spots" and letting them potty.
That said, we
DO NOT do group walks and that's a service I would expect to pay much less for if I was open to it.
I walk one dog at a time, at most 2-3 if the dogs are small and know eachother or live together (the only group of 3 we have are a group of frenchies who really get along very well)
and I of course would want background checks of the walkers and a solid business behind them.