I have thought about it, and on the average day of river fishing around here, you only run the big motor maybe 1-2 hr tops. When we salmon fish I would say the big motor runs for maybe 20 minutes the entire day.

If you are a weekend warrior 46 hours on the main would equate to 30-40 days on the water the way we fish. Pretty legit considering there are 52 weeks in a year, but there aren't 52 weeks of fishing per year.