man, this sure got off topic
You gotta wonder how many guys go out and buy new hour meters every time they rebuild/refresh etc.. Point is, unless you're talking about 15 + year old boat, it doesn't matter. You can not compare running hours in the water to sitting on a trailer.
All fiberglass boats continue to cure until the day they are cut up and disposed of.
If you can tell that a boat was taken care of reasonably well and there is no sign of severe damage from the elements and if nothing comes up on a moisture meter, you can use that hull for decades.
I covered the concern about rigging, plumbing, pumps etc in the earlier post.
Large yachts sitting in the water is night & day compared to trailer boats.