This is my best answer, to a question I am often asked, concerning how best to finish a writing project. The biggest single contributing factor in writing success, is being consistent.
Yes, you can write twelve hours a day if you want and if your circumstances allow such things, for the rest of us, it is more snatched moments, stolen from an otherwise full life.
It is all very well giving your all for a week or two, but if after that you have a tendency to drift off to pastures new, your project will never see completion. Far better to work in short periods on a regular basis, because working this way can and does get the job done.
Try every day
I try to write every day. Notice the word ‘try?’ Some day’s life gets in the way, I have a day job and family. But, most days I succeed, if only for an hour or two and it’s that which grows over time and ends with completed projects or books.
Now, I’m not talking here about deadlines, because if you have one of those, you had better stick to it, or else face the consequences. No, I’m talking about writing something which until it’s done is nothing more than a personal thing.
My best piece of advice if you want to write is simple, write.