Professional detailer here. If you want your paint to last, you MUST have some sort of sacrificial layer on it and UV protection. That's what wax is. Waxes last 3-6 months, sealants usually 6-9, and you can have it coated ($$) and it'll last a couple of years for the heavy duty stuff, or about a year for some of the less expensive stuff.
Untreated clear coat will fail faster.
Case in point, the clear coat on the basement of my new-to-me Newmar is about 1/3 failed. I had to sand and respray.
Kevin B. Davis
1996 Newmar Kountry Aire 38' 3755 Ford F53 7.5L Gasser