I would assume that totals hours vs dual received hours, as a percentage, probably becomes smaller and smaller for the commercial pilot, but maybe I'm wrong... I'm not a commercial pilot, but I've been flying for almost 30 years. I have a PPL, instrument rating, complex, high performance, and tailwheel endorsements. My ratio of dual received / total hours is 8% (94 hrs dual, 1180 total hours). Just curious where others may be at. Obviously, new pilots, low time pilots, and pilots with lots of ratings will be higher.