Is there a "Cap" on the number of visits you can do in one day?

Did I miss this when I signed up? Is there a "cap" on the number of "shops" I can sign up for in one day? Reason I am asking is I am driving 1-1/2 hours to the location and would like it to be profitable if I am driving the distance. These are all the same type of "shop" and I can easily do all in one day due to the type of "shop" it is.