In order to get a lot of miles in during the winter I sometimes do trainer videos back to back until I get 100 miles or so. The thing is I take a small break in between videos. Usually somewhere between 5-10 minutes. This gives me time to refill a water bottle or 2 and eat something small usually a Power Bar or equivalent. It's not really that long of a break and I don't race. I like the videos for improving my overall fitness more than anything. Although the hill climbing ones were a huge benefit. My heart rate doesn't slow that much. Am I cheating myself with these breaks or is it more or less equal to small stops for red lights and such when on the road?