I have a "workwall" in my bedroom/office that I use to keep an overview on what still needs to be done. I used it to push the game into beta and I'll use the same approach to get the game ready for its release.
Essentially each note consists of one task and I'll try to remove one of them per day. Oftentimes this doesn't completely work out, because some tasks take more time than others, but it keeps me from doing whatever comes into my mind.
I can't give an estimate, but you can roughly say that once this wall is empty, the game is reaaaaallllyyy close to being done.
I'm going to update this thread from time to time, to show you my progress.