Star Trek: The Motion Picture, one of the most hated films of all time, could be said to be one of the most boring as well. You sit through 3 hours of Kirk driving around the newly reconstructed Enterprise, then you learn that the main enemy is a satellite. No wonder everyone hates it.
The movie clocks in at about 47 hours long. If you're brave enough to watch it, you're the biggest Star Trekfan on Earth. Or you're just incredibly stupid; or both!