A customer of mine purchased 315 ft of Black Diamond Edging and I have installed approx 120 feet so far, I still have 195 to do but am having a hard time pricing it out. He supplied the materials I am just doing the labor. It took me and another guy 6 hours for 120 feet and 3 of us are going to finish on Friday. Shoudl I charge hourly or by the foot, remeber he purchased the materials alreday. Any help would be great.