At 1 hour/day for 100 days (assuming you also scan on weekends) you'd be through all three thousand slides in under 4 months. Just make sure you have a scanner with digital ice, and if you're scanning kodachromes make sure your scanner's digital ice can handle kodachrome as one of the dyes can absorb infrared and that introduces all sorts of artifacts. If you didn't buy a scanner with digital ice, well, then it'll take you a lot longer because you'll have to spot all the photos yourself to get any dust off that your cleaning didn't get.
That's assuming, of course, that taking the slide out of the tray, cleaning it twice, scanning it twice (once at low-res, once at high-res) plus color correction can be done in two minutes or less. In my experience it takes a bit longer.
Besides, the best way to look at slides is in a slide projector. There's nothing that looks quite like a projected slide, and used projectors are dirt cheap these days!
4 months, at an hour a day, ugggh I tried scanning all my negatives, probably about 2000 about 5 years ago, didn't even get through the first years shooting..... It's a little like watching paint dry....