Was pretty common for the high time guys to have Viet-Nam then Heli-Logging experience. A co-worker retired a couple years back with over 31,000 hours. Have known several over the years with close to that.
My own route (for what it's worth), is Viet-Nam, Heli-Logging, Construction, and Firefighting.....coming up on 25,000 helicopter hours, most all in heavy machines.
Still just a high time student pilot....