On the hammock I made last night, there are 2 15 foot 1 1/2 inch webbing straps attached directly to it. To make things simple for myself, I used the Ultimate Hang Calculator, thanks Derek, to figure out how long my suspension should be for each distance between trees and the height at which I should attach the suspension. Here isthe result
The bottom number is the distance between trees.
The Mark indicates where the strap should attach to the tree.
The top number is the height of attachment.