On my commuter bike the summer rims have worn past the 'V' wear
indicator after 6-7 years. They are Alex DM-18's. I do a bit of
heavy braking on a steep downhill shortcut. Spokes are good and I
will get another set of the same rims.
Road bike doesn't get that kind of use and I expect the rims to last
almost forever.
So YMMV.