once and I seem to remember it taking something like ~1.5 hours to get it completely bled properly (didn't have speed bleeders at the time). By comparison I flushed my complete brake system, including ABS, and it only took about ~30-35 minutes (albeit WITH speedbleeders). That's why to me the clutch system seemed like a pain (relatively speaking anyway).
Z-Jay Vice President - Edmonton Z Car Club 93 300ZX TT - Stage VI