I always base it upon the situation. I have some stands that are only 16'. I also have 2 stands that are pushing 30'. It just depends. The stands that are near 30' are in a pressured are where the bucks are very skittish and very wary. The tree my stand is placed in is great concealment where I have the stand in a sort of "crows nest" where the tree splits open enough between multiple branches to keep me very well concealed. Personally I feel most comfortable around 20'-22'. But the best way to go is whatever the situation calls for and you being comfortable with it.