yeah i'd believe that, and you also should remember that DB is talking about WA climate, hot and dry. I would wait at least a week per coat and check it after that. I usually try to level out all bumps in each finish coat with 2000 grit wet before the next DT final as the bumps are cumulative. If you take them off as you go you'll get a smoother last coat.
Look the patience required is not for everybody, there are other options. but its up to you.