rifle/shotgun/crossbow - all day
compound - probably for 2 minutes, maybe longer. I never shot near my peak weight though, always around 60 pound
longbow/recurve - about 6-10 seconds and then I get too shaky to shoot straight holding the full weight of the bow. Whole different ballgame guys.
JWhite - I wouldn't worry about it. Draw your bow smartly, when the game is close and the shot is ready. You'll be fine, and you'll continue to get stronger through practice. The comment on drawing, holding for as long as you can , then bearing down, focusing and making the shot is excellent practice IMO
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