I like to ask people who sign up for the "Dissertation Writer's Toolkit" what the biggest challenge is in writing their dissertation. Here is what one wise responder wrote:
Feedback. Writing something, say a chapter, and getting feedback from the supervisor on it. Somehow it always goes on the 'to do' pile ....and you wait and wait. I found it was much more helpful to agree to a deadline, and push push push (in a nice way) to have my supervisor look at it. It doesn't work long distance; you have to be right under their noses and booked on an airplane and out again 10 weeks later. Somehow the whole thing will be done, written, corrected and finished in that time. Worked for me.
Sometimes students are just too 'in awe' of their supervisors to expect action, and politely sit back and wait for the feedback. I have friends who waited 6 months for chapters to be returned. I waited too long, too (I was 20,000 km away), then I just got fed up, shipped the kids off to Grandma and got on a plane.
I'm very much in agreement with this writer. Professors are human; they sometimes need deadlines, they often operate in "overwhelm mode." So especially if you are writing your dissertation long-distance, consider the airplane and grandma method that is recommended here.