The title is a bit misleading and I'm not entirely sure what the "1 hour" actually refers to. The author suggests studying 10 minutes at a time, preferable twice a day most days of the week (so that's 1-2 hour a week). He also suggests going to every office hour (so that's at least another hour per week). That's in addition to treating class like you are studying (2-4 hours per week).

In reality, this is "how to get a 4.0 without cramming".