For those as forgettable as me, farming a stage can easily result in me forgetting when I actually started it. Most of the times we want to match the farming times with our errands, getting the rewards on time when the errands end.
For that I suggest adding a small timer to the auto replays which tells us for how long a farm is going on. And the best part is, we can choose in the replay prep room if we want the timer being displayed or not. So we're not forced to see how long our inefficient farms need to clear a stage.