12' always seemed fine. Just make sure you dont silowet . I think that is the most important. I like being in clumps of trees that are close together. I think it is a bit safer if I ever did start to fall I could likely grab a tree. Never happened yet thought.

But the fruits of the spirit is love, joy, peace, patience, kindness, goodness,faithfulness, Gentleness and self control. Against such things there is no law. Galations 5: 22&23