The truth here is you are worrying about a nit. The problem is we all do.
If you have a story idea, and if you have outlined it, if you have all your characters identified and fleshed out. If you know what your plot points are, then write your opening paragraph and stay with it until you can read it and say, I would like to read this novel.
After that, how much time do you have in a sitting to write and how many days a week will you write.
I want to write a thousand publishable words a day. I write detective novels that tend to run to between 50,000 and 60,000 words. I write to entertain, and to provide a ripping good yarn that provides interesting characters, an exciting story, and a satisfying ending. Then I add an epilogue that leads into the next book.
I have yet to accomplish my goal, but that is what I try for.
Author Jonas Watcher: The Case of the Running Bag