OK, I though the claim of a 4 hour cut of Blade Runner was insane! I knew there were a lot of cut scenes for TPM, but not 6 hours worth!
Why is it insane? A rough assembly cut would easily clock around 4h and seeing as Scott tended to shoot quite a bit of footage I'm actually surprised it wasn't longer (as a matter of fact there are reports that even this cut had some missing scenes). Basically, the approach was to cobble together some footage in order to create a rough structure and to work from there. It's probably the most sane approach to dealing with truckloads of film there is.
And since we're already talking about this, I'd kill to see this cut of Blade Runner and (getting back on topic) I'd kill not to be forced to sit through 6h of a TPM.