I just replaced a rear tire 26 x 1.75 Schwalbe Marathon on my commuter bike.
I got over 20,000 miles on it in about 3 years on 2/3 paved, 1/3 gravel flat roads/paths
No punctures or issues in that time (I have the extra thick thorn resistant tubes with slime inside, slow, but reliable)
The last few months I was patching small nicks in the tire tread with Shoe Goo, just in case.
The sidewalls were still fine, but most of the tread was gone.
These are worth $60 each