Riding inside sucks period whether it's on a trainer or rollers. Do what you can to make the time go by quicker. I've spent a good bit of time on mine the last two winters here in good 'ole PA. Do what you can to by some time. Intervals, movies, etc.. I usually sit infront of my old bigscreen out in the garage with a pair of headphones on and watch the clock to adjust intervals / my effort. An hour is what I usually do. After that, minutes seem to turn into hours & my attention becomes lost.