Hooo boy okay so, the series that I wrote that was the longest was actually a trilogy I made when I was cutting my teeth. When I was 14 I wrote a trilogy series at about 230 pages (though I can' remember exact word count it was over 100,000) per book. Granted my trilogy was a pile of crap and I'd never let that horrible thing see the light of day but, I was a very determined kid. During that time I also wrote short stories usually at about 50 to 100 pages a piece.
Currently I've written a few novels, each around the 200 page mark and each for different series I've made. I tend not to work on a single project at a given time, so I couldn't tell you how long it's taken me to write them, on account of I'm often doing multiple unrelated projects at once. It's just my flow, as I get bored locking in to a single thing all the time, so I tend to do lots of things in order to keep my interest bubbling. So far it's kept me out of those dreaded artist block and writers block troubles I used to struggle with.
I love to write both kinds of stories: long and short. I love stories that span several novels because I get to feel like I'm on the long adventure as I go. I also love writing the short ones since they're just their own self contained story to enjoy in an afternoon on a good reading day. I've also written and published a children's book because, why not, right?
In what I've been doing for my tapas novel (in terms of keeping a schedule), I treat my schedule like I'm at work: Draft, edit, proofread, post and I only post once a week, so that I can make sure that I at least give my work some editing so my readers don't have a break in their reading flow. I draft on Monday, Edit on Wednesday, Proof on Friday, release on Saturday. Sometimes I can get all of this done in one day, but I also have to square that with having two jobs and a webcomic I'm keeping up. Ultimately it all depends on how work turns out, which determines what days I get to do what thing. Ultimately I just want to get something up on Saturday, so I push myself to stay on schedule by being mindful of my time. (This is especially true of long stories, since I'll be doing them for a while)
I think, so long as you are putting your heart into your work and it makes you happy, then you can work at whatever schedule you please and post when you want.