I am sure the longer the bow is strung the less power it has. However, it is beyond my capabilities to notice much, if any, difference. The old field Archers swore their was a difference and they would unstring their bow after every shot. Both Pope and Young only strung their bow immediately before taking a shot. Pigger is strung whenever I am hunting, I am sure it this has caused an extra inch of set over the last seven years. However, she still performs well enough to kill anything from a rabbit to a moose, so she is braced while afield.