you're dealing with 2 things...a "rule of thumb" which never applies to everyone...and an "average" which is practically useless for a sample size of one.
Flip a coin once....you have a 50% chance of getting heads....but your actual results will be off by 50% from the average.
I think for anyone to give you a useful answer, you'd have to describe your boat and useage a little. ie: a 15 year old, 35 foot boat with twin diesels, no generator, air conditioning, and full electonics, and you expect to run the boat for 25 hours per week. I know that may require information you don't have....but without some sort of guideline, I don't you'll get very relevent information.
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