From everything I have read and experienced the longer you leave a wood bow strung the more the fibers conform to the stress of being strung (string follow). For the most part this will go away as the bow is unstrung and relaxed, but my concern is performance after being strung for long periods. The more string follow the less stored energy to transmit into the arrow. For this reason 2 or 3 hrs tops and then I unstring it and let it rest for a while.
Not a scientific study but a couple of years ago I made a bad hit on a running deer with a rock point. Was hunting all day and had just restrung my bow after a 30min rest. Arrow pierced the upper front femar and just exited the scapula on the other side. This shot was about 15 yrds. Last year I had hunted about 4 hrs with same bow and another rock point, as I was getting down out of the stand a big doe walked up on me at 16 or 17 yards, I made a hasty shot and looked like i was barely forward the engine room clipping the scapula. Point liked about a 32nd going completely into the deer, she ran a few yards and arrow fell out. I have replayed that over and over, I made full draw and nothing was in between shot to foul it. My knapping skills had even improved leaps and bounds over the year before, point was thinner and sharper. The only thing I can think of was my bows string follow slowed the arrow down and just didnt get the penetration.