I shoot everyday. (barring weather).
I am never "happy" with my accuracy.
I shoot 10/ 15/20/25/30/ and 40 yards.
I do most of my missing at 30-40
But I hit a lot more than I used to. However, longest shot in the woods I took was about 18 yards.
We all miss, we all botch shots. My last one was botched. She still went down, but instead of lungs I hit the shoulders. Point I am trying to make is that I don't know if there is EVER a time when one is absolutley comfortable and satified with their accuracy. I personnaly am never completley happy.
But the more you practice ALL the skills, shooting, stalking, woodsmanship, etc., the more you narrow the chances of a miss, and broaden the chances of sucess.
Personnaly, I think we tend to over focus on just accuracy. Or speed.
I think woodsmanship, old fashioned hunting skills, location choices, scouting, scent control... All of those have equal places in the game. As well as accuracy, quietness of the bow, good release, etc.
I think if a person makes the choice to walk off into the woods for the intention of killing game, he/ she owes it to the game, to nature, and to themselves, to be as good, as efficient, as accurate as they can be. I am also a man that fears thinking he is now "good" or "good enough". I think there is always an avenue of improvement, and a need to travel down that avenue.
I realize this isn't quite what you were asking, but someone messed around and left me a soap box to stand on...
Jim