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STEPHENSACKRO,
if you haven't already done so, do check out the provided link. My recollections of my build have become fuzzy. The OP in that link provided all the formula/calculations needed. Your 38 RPM may be a wee bit slow, but I don't think that is a bad thing. Especially, when the subject of this thread is peening. A slower speed may require a bit more time, but may also reduce peening.
Run time has always been connected to the condition of the brass. Severely corroded brass may need 3 hours, while cleaner brass will require 1.5 - 2 hours.
I don't know what the commercial plastic drums sound like, but I push my rig outside because it is so danged noisy.
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