Here is a sample of an 1.5 hr interval workout on rollers. Several interesting observations can be made, which I will leave to the reader as "homework." The intervals are 2 minutes, 1 minute and 30 seconds. Power in red, cadence in green.
Another set added in on Tuesday, March 22. 1 hr ride. Same rider. Scale adjusted.
Another set, one hour, added on Wednesday, March 23. Different rider.