If we assume that engine wear is based on mileage, hours, or use:
It's really revolutions of the crankshaft.
If you drive around at 3000rpm instead of 2000rpm, at the same vehicle speed, you are doing 50% more engine wear per mile.
it doesn't necessarily work out that way, but it is a good model to keep in mind.
Buzzing the redline all the time is tough on a motor.