mrshherera - The official rule is 1 night at any of the Horseshoe Meadow campgrounds.
However, if the area is not busy (i.e. weekends in July/August), the rangers tend to look the other way as long as your campsite is neat and your not causing problems, such as leaving food out or beer cans all over the place.
I've spent 3 nights at one site in Sept and had no problem.
