[SwellJoe]

A 20-30 minute workout a few times a month is much less than anyone expects to spend on exercise for dramatic gains, no matter how you slice up the time and how much ancillary stuff you include in the "time at gym" equation. All of the classes at my gym are ~60 minutes. I'm doing Occam's Protocol from the book, and I get in, do my lifts, shower, and get back out, long before those classes finish their workout. And, I go much less frequently than I thought was necessary: a couple times a week. I haven't been doing it long enough to know what the results will be, but the science is solid.