I think, standing in front of a target, most good archers can be proficient in a day. As Greg said, getting used to the new setup in hunting conditions is a different story. I like to have plenty of time to practice shooting from a crouch, kneeling, sitting, and any other position I might find myself in. If I found myself in the position of needing to shoot a new bow, I'd be more aware of taking higher percentage shots, until I was completely comfortable.

Phil.