I guess like many I find indoor training mind-numbingly boring. Say my training schedule called for a 2 hr ride for the day and I was forced inside due to the weather, I was wondering if I could split the 2 hrs into 2x1 hr sessions and still gain the same benefit? If so, is there a minimum amount of time required in each session eg 2x45 mins = 1.5 hrs, 3x30 mins = 1.5 hrs etc? Taken to the extreme, I find it difficult to be believe 30x3 min sessions would be the same as a single 1.5 hr session, but at a more sensible level?