if you are asking for a rule of thumb, i have always heard on average and outboard lifespan is approximately 1000 hrs, with the average recreational boater using it 100 hrs a season. all of the above are correct though, commercial guys get thousands and thousands of hours and trailer queens much less. like all rule of thumbs, there are many exceptions to this one.
side note: we were chainsaw dealers from 69 to 86 and then the average life of a homeowner chainsaw was 4 to 6 hours.
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