With regards to text size and scrolling. I have been writing my chapters at a minimum 2500 words. That's for reasons aside from the fabled "People won't read more than [x] in a sitting."
1) Fictionaut has an option in each story post to allow people to read the story in PDF Format. If you click on it, PDF makes the story look cleaner and professional. I highly recommended it to anyone who enters my Group Page. But one of the things PDF does is increase the page size. Let me put it like. On my Word Doc each chapter of Arcana Magi average 6 pages, once I post it up on Fictionaut and you view it in PDF Format, it stretches out to 12 to 15 pages. If I wrote my chapters at my usual 10 page minimum on Word Doc, the pages would stretch out to over 20 pages. And believe me there are people on Fictionaut who have shared dismay over reading 2500 pages. There is also a second option where you don't have to read in PDF format but you can change the Font Size of the text to reduce the size of the web page. Both options sit right at the top of the title on every story's page.
So there really is no excuse to not read past 2500 words on Fictionaut if there are options to make a person's reading experience more convenient(SP?). That and the fact that no one is forcing readers to sit through one reading for any story. You don't see J.K. Rowling telling everyone to read Harry Potter in one sitting. I would have said Shakespeare, but someone would point out that he's dead.
2) Another reason is that sometimes Fictionaut cuts off the last paragraphs of a 7000 word story after a copy/paste. It has to due with font capability more than anything but its very annoying. I went though it once and it drove me mad. I had to type it directly onto website which meant I may have made more new grammatical errors after having removed them the first time around,
As for my posting time. I think I will post 4 times a month starting in March. From what I could tell on the calendar, there would be a one week rest period between the transitioning months. This would give readers a chance to catch up if needed and not feel rushed. And I can still take my time to get everything in order before the next postings.
Thanks for the advice everyone.