My thesis was arranged in three parts so that made it a little easier. I think I took until the end of summer to finish and worked on one part each month. But to start I had a rough draft of the whole thing.
My problem was rewrites. The professor who was guiding me through the process had me rework and rewrite whole sections. I often didn't agree with her. But I could see if I didn't comply she would never sign me off. So there was a bit of a power play which I didn't like.
Much of my thesis contained Sanskrit words and that was difficult to format. I had a friend help me. This was years ago when computer programs weren't sophisticated.
I am sorry to say that although parts of my thesis were reprinted online...and it was used as a basis for a curriculum...it is all a dim memory. It wasn't my favorite project. It wasn't my best project. I was exhausted at the end of a vigorous three-year program.
My advice is set it up in a way that makes working on it easy...then bite the bullet. It doesn't have to be your best work, or perfect work. It has to be finished work.