This is sound advice and a principle that I have always worked off of. "Sometimes you eat the bear, and sometimes the bear eats you" comes to mind. Very rarely should the bear end up eating you though. :slaphead:
The auto industry probably has the hour book down better than anyone else, 10 hour book job takes 4 hours, until you run in to those rusty bolts.
Yes they really do have down to a science, once i started doing a flat rate system i started making great money.
And yes there are those jobs you lose your shirt on but the more you do it the more you find ways to avoid those job killers.