My boss's 68' Hatteras stays in the water year round except for about a week dry dock for a hull clean and any maintenance that cant be done while moored. This is typical of larger salts and any lasting effects on the hulls are mooted by yearly cleaning and prep.
...and bottom paint
I don't know of anyone who paints glass but I suppose if you did it would be best done while in dry dock.
http://www.jamestowndistributors.com/userportal/document.do?docId=292You know about as much about bottom painting boats as you do about football
Not common in bass boats, but damn common in sport fishing and other motor yachts, most of which are made from "glass"
To answer the Op's question, depending on how often you use it, it will stain, and get algae on the hull..... every through hull fitting is a place for water intrusion to occur.....you know all that though.....will it rot? The answer is it depends on to many variables to know. I had a boat as a boy that was in the water 24/7 for 4 years....but it wasn't a nice boat to begin with!