Stylus life will, generally speaking, be determined by stylus profile.
Cheaper, bonded conical styli would be the worst, probably not lasting more than 500 hours. A high quality nude conical/spherical stylus like those found on the Denon 103/103R should be good for around 800-1000 hours.
High quality nude ellipticals around 1200 hours.
The more exotic profiles with high quality styli (Fritz Geiger, Van den Hul, Micro Ridge and various line contacts) should be good for around 1500-2500 hours.
All of the above estimates assume good vinyl hygiene. Start playing dirty or damaged vinyl and the life span of the stylus will probably be reduced.
Cheaper, bonded conical styli would be the worst, probably not lasting more than 500 hours. A high quality nude conical/spherical stylus like those found on the Denon 103/103R should be good for around 800-1000 hours.
High quality nude ellipticals around 1200 hours.
The more exotic profiles with high quality styli (Fritz Geiger, Van den Hul, Micro Ridge and various line contacts) should be good for around 1500-2500 hours.
All of the above estimates assume good vinyl hygiene. Start playing dirty or damaged vinyl and the life span of the stylus will probably be reduced.