It it not worth the time. You are going to sit for hours. I did 100's of sliders and used Scan Cafe. They send the scans to India and then scan them there. Really good prices, good communication and give you all kinds of options on formats, choose / reject scans etc.
I probably spent the same amount as buy a scanner, but I figured it was a one-off deal and I could not buy a high speed / quality scanner for what I paid.
Attached a low res scan of a slide for 4x4 content. Original RTT on a Land Rover in Mozambique.