What if you buy a brand new Rolex and leave it there for 10 years

[Kanger]

I read about a double red sea dweller that was gifted to a man on his wedding day, who wore it that day, and in that he was not interested in his watches, put the DRSD in his safe for the next 25 years. Needless to say it never got a service in that interval and just sat in the safe. Curious enough, as Rolex technology has progressed and the usage of new "synthetic" oil, what will happen if a brand new Rolex bought today, say a Sub C or a GMT C just sat there for 20 years unworn, would it need service or would it still work like a charm in 20 years?

I ask because I have some BNIB pieces that I collect with full plastics, and am not sure what I am going to do with them in terms of servicing lol.