I just shot a doe the other evening at 20yrds. Perfect heart shot. Still waited 1/2 hour before climbing down out of my stand. Then I went to town, got an extra flashlight and batteries. I didn't start looking for 2-1/2hrs total. Even though it was passthrough shot there was hardly any blood. I found the deer almost 500yrds away under a blowdown. Actually stumbled upon her following a dry creekbed. I then tracked back to check out the blood trail. There was no blood the first 75yrds, then very little. I'm glad I found her. I got lucky. And this is with a "good" shot. The heart was actually cut almost in half and the deer went that far even without being "pushed".... I will never attempt to locate a deer without giving it at least an hour regardless of what I shoot it with. Unless of course I actually see it go down. Just my opinion. Good luck out there... there will be more opportunities.