A lot of things are going to affect tire life. How much you weigh, what your road conditions are, etc. I'd swear road conditions vary year to year for me, one year my tires seemed to get tore up by tiny triangular shaped rocks and I only got 3,000 miles out of my Panaracer front tire (T-Serv Pro-Tex 26 x ~1.5), and yet its identical replacement (ordered at the same time even, one assumes same batch) is still going strong, with no signs of being worn out or torn up like the first one was, and it's at over 4,000 miles now. Basically two different years of riding, over the exact same commutes pretty much though, yet one tire is just starting to show wear and the other I rotated out of service because it was so cut up that it was starting to get flats.

I have yet to properly wear out a Vittoria Randoneur Pro and I've put thousands of miles on those. Conversely, I killed Continental Gatorskins (26 x 1 & an eighth) in six months on the same commute. Less than 1,500 miles on those. Probably doesn't help that I'm a big Clyde** and I ride year round. The roads seem to sprout lots of little sharp rocks once it starts raining. I suspect tires take a lot less wear and tear in the summer, when not is it not raining for cars to tear up the pot holes that appear and spread all the little rocks around, but also there's a lot more bikes out, effectively sweeping the areas bikes usually ride.

Buddy of mine that is a bike mechanic says he gets about 5,000 miles out of his Vittoria Rando Pros, this seems like a good figure for a durable tire rode by a normal sized person, both touring and year round in a wet climate. I had a couple of incidents* with my rear tires so I don't think I've put quite that much on one yet, and neglected to note down exactly when I put the last one on, it's around 3,000 miles and might as well be new as far as appearances go.


* In a rookie move, I managed to set up one of my rear pads so that it was making contact with a sidewall, and so I killed one long before its time. Got an opportunity to try out a Park boot though, and it not only got me in to work that evening and home the next morning, I felt confidant enough in it to ride one more day and pick up a new rear tire from LBS on my way home the next day. Put nearly 30 miles on that boot. I also had another one randomly blow a sidewall in my living room, I assume the delayed effect of scraping it on a hard, square, piece of concrete while loaded touring a couple weeks before. I was moving uphill and surprised by a type of speed bump I had never seen before, it had cut outs in it for a bike to slip through, but they were quite narrow and I had a load on both the front and rear racks, which combined with climbing meant it was very difficult to keep a perfect line to make it through the small gap and I ended up "kissing" the very square edge of the speed bump with the sidewall of my rear tire. Thought I was good as it didn't blow at the time, and I didn't spot any obvious damage at the time, but I assume that is why the sidewall blew a couple weeks later...

** I'm about the OP's weight.