So what is the optimal draw weight for hunting?

Clearly it will vary from person to person but should it be the highest weight you can shoot accurately....but for how long....I shot a friends bow @ 60 lbs...was accurate for some 20 shots then clearly got fatigued...however it did seem to shoot better at longer distances than my 45 lb bow...faster and flatter...more punch.

That experience has me thinking I should move up in draw weight.

I relize this question is poorly formulated but hope folks get my drift....