Did you guys see the ad for 20' lengths of EMT? Guess that shoots the 10' theory. LOL
The 'coil length' Sparky referenced (100') might work. So, a 90' chunk of greenfield with suitable bushings on the ends may be construed as a sleeve, but....support the greenfield; or 'snake it in'?
It's another of the gray areas that are AHJ accepted or rejected.
BTW: Do you guys agree on the 'electrical materials' for sleeves, or is plumb DWV or PVC sprinkler scraps OK?