Well the coffee for my ears are the 3 tracks that I work on at the same time. That doesn't mean that I am able to finish all three faster and get great results but it does give me a release, if you will, from working in that same damn loop for days on end.
Being stuck in that loop mode can easily lead to destructively overworking the track as you know it needs something else but you can't quite hit it. That is the time to either:
1. Let your mate hear it and give you some feedback
2. Park it and come back to it later
Otherwise be aware of the above facts and use your best judgment.
Curiously enough, recently I went back to the original idea of several tracks and ditched weeks of so called 'progress'.
