I tiller the bow till I think it is perfect (looking) @ 26" at least and then shoot it in. Maybe 20 - 30 arrows, and ill check tiller, see if one limb is stronger, one is weaker, pick what limb I want to be my bottom. It is strung and restrung, and shot alot when I am finishing and fine tuning it, but I don't ever leave a bow strung for longer than I am using it. The only bow I would consider doing this is a sinew backed bow to give the sinew some time to stretch, but even then I wouldn't do it. Just habit though, not saying it's the right thing or the wrong thing to do.