I don't understand. I timed myself one time, using/not using the harness on the way up the tree with a climber stand. Having it attached and sliding up the tree while climbing took an extra 2 minutes to get to my height. That's it. 2 extra minutes, just sliding the rope up the tree and re-tightening it to make the next move up with the stand. That 2 minutes don't mean anything to me. That harness gets attached to the tree the second I step on the platform.