Here is a quote from Pat's site. Seems to make sense to me. (Disclaimer - I use an ONNO paddle).
Real world #s: 1stroke = L-R-L
40oz. plastic 25oz. ONNO Signature = 15oz. x 20 strokes per minute = 300oz. x 60 min. = 18,000oz.
That's 1125 pounds per hour you are swinging around needlessly. Hey, you just filled 22, fifty pound bags of sand with your hands on your leisure time. Or 1500 cokes.
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