Although you must wisely manage your time and tasks, scholarship is often an inefficient affair. You won't be able to devote an hour to writing and get exactly an hour's worth of efficient prose out of it. The mind must have enough space to play with ideas without the pressure of having to produce a certain number of words. This is the "higher efficiency."
As dispenser of advice, I advocate regular writing, so as to allow the time for this play to occur. It cannot occur in a vacuum, but only as a part of an already reasonably "efficient" schedule.
I realize that I did not put together a chain of more than three days of continuous work in August, until today. I never got to that fourth day, and as a consequence I had a difficult time reaching that stage in which I could work with the inefficiency I needed to be truly efficient.