I've read in the past that he got fired after only 8 days of principle photography. I've never heard an actual percentage about how much of the footage in the film is actually his.
As I have subjected myself to this crap, I would hazard the guess that its the main plot scenes of the story so about 10-40% of the film. So much padding.... There is one scene of 3 naked women on a boat while one of them reads a poem for over a minute... Why??? I don't know, they have 2 other scenes I can remember, the first was tricking a mentally handicapped man into getting them food and then the 3rd scene being eaten by killer fish.
Awful film. I would says its far worse than Troll 2 but I enjoyed troll 2.