I've found that having a huge fan in front of me when I'm on the trainer has made all the difference recently. Last winter, I could barely stand to be on it for 30-45 minutes (max!) and didn't understand how any sane person could ever do more. This past winter though, I got up to 3-3.5 hour rides on the trainer. Not ideal, but with a gigantic fan and a football game on tv, it was tolerable...