I'm mulling over taking class(es) on long range shooting and seek information. I am currently looking at two classes. One is a one day class with whatever gun I bring along that's capable of long range and the other is a three day class run by Barrett with Barretts only. For a reasonable fee they rent everything for the class and all I'd have to do is show up with my personal gear like eyes and ears.

Is one day enough? Is three days overkill? Or is three days just a start? Barrett has two classes: Long Range 1 and Long Range 2, each are three day classes.