Since you have the whole thing finished, I agree with the chunking plan! Something like an average of 5 pages (base the actual number on the flow of the story), twice a week. They will probably be the best if both worlds where you're getting things out into fresh without annoying people with daily updates. And posting enough content to make things feel well based and captivating.
Success will vary depending on genre, talent, trending, luck, etc, too, so don't get too hung up on numbers.
Good luck! It's always a great sign of commitment when someone is able to plan and finish a story! ️