When I'm finished, to be honest. I'm writing one main series, and three side series to have some finished works. It usually takes about a day to write, edit, and post. Accounting for real life, I end up posting three or four times a week. A schedule would drive me mad. I think it's overestimated how much readers actually care. Yes, they want consistency, but I'd think if you're releasing multiple chapters a week, that's consistent enough. I'd only be annoyed about no schedule if the time between chapters was long and irregular. I read every One Punch Man chapter, and I never really know when it's going to come out. That being said, OPM is goated. If a web novel had such inconsistent scheduling, I'd probably drop it altogether unless it already hooked me. Many popular franchises succeed despite inconsistent releases though. With ongoing series, it really seems like completion and cohesion matter more than specific release date. Fans will stick with a series that has proven itself regardless of if it releases on Tuesday or Friday. It's just a matter of if your story crawls to a snail's pace because you're releasing every few weeks at random.