When it comes to fry bread dough, there is no set answer for how long to let it rise. This is because the amount of time needed will vary depending on a few factors, such as the temperature of your kitchen, the type of flour used, and the size of the dough balls.
As a general rule of thumb, you should let the dough rise for at least 30 minutes, but no more than 2 hours. If you let it rise for too long, the bread will be dense and heavy. If you don't let it rise long enough, the bread will be tough and chewy.
If you're unsure, it's always better to err on the side of letting the dough rise for a bit longer than to not let it rise long enough. Better too fluffy than too tough!