The camera type scanners should be fast, but seem to have lots of driver issues based on all the posts here. You can do the same with a digital camera, a suitable closeup lens, and a homemade rig (clothes pin on a board) to hold and illuminate the slide. If you have a camera that can manually focus, set the distance once and then you can crank thru slides. I have burned thru 100 slides an hour this way.
The flatbed and dedicated scanners run 1-2 minutes for the scan. Trust me, you get bored silly, pushing the holder thru a manual feed scanner every 1-2 minutes, or waiting 8 minutes for a flatbed to do 4 slides. If your scanner supports digital ICE, which is a separate scan that looks for dust so it can subtract it from the image, add another 1-2 minutes per scan if you turn it on. If you go at max resolution, add more waiting time. It's a tedious job. I can do 30-60 slides a night before I get bored.
If you want good results with no boredom, they say buy a used Nikon Coolscan with a magazine feeder. Load it and go to bed. In a month, you will be done.Then sell it for about you paid for it. I would like to do that, but the initial costs ($600-1000) are too high and I fear I would get stuck with the unit if it broke.
Among the scanners I've owned and used, the Epson V500 flatbed (apprx $170 on sale in the USA) is a good one. It scans 4 slides or two strips of negatives, and its software will break the scan up into separate images. It's also a good general purpose scanner.
With 3000 slides, you will be very close to whatever you buy for a long time. Why not get something that will give you good results.