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I guess with you guys talking about timelines with over a million words, my 160,000 word and growing is still considered small.
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As a timeline writer something I do notice is not all readers at least hit 'like' or better, make a comment to show support. I see that with all timelines I've read, not just my own. If I start reading a timeline I will at least hit 'like' to show support and appreciation, and for the hope the author will continue. I don't think every reader is doing that.
For my own timeline I tend to look at the day-to-day increase in viewer numbers because that seems to give a better indication of the number of readers. 'likes' fluctuate wildly and can be really frustrating, and sometimes comments are not always about the recent chapter. So then I ask myself whether or not I should continue sending my chapters to this forum. I think there must a little of that going on with the 'big' timelines too. If a writer feels like they're not receiving enough feedback and support, its going to eat away at their self-esteem. Then they just stop posting their stories due to lack of interest. In which case they may continue writing and never share their stories, or they may take their timelines elsewhere.
Most people have lots going on in their lives, like others of you have said. For most of us timeline writing is a nice creative hobby. At the moment I'm on summer break, so I have lots of extra writing time. After school starts again things will be different and I'll probably go back to sending a chapter every 3 or 4 days.
I would say that anything over a novella length TL (We'll call that anything longer than 40K words is long, after all, you're still talking a few hours of solid reading time to consume a TL of even 40K words.) is worth of the designation of a big TL. Stories like "Out of the Azure Main" over in the ASB section go into their own category, as they are massive. That one, if memory serves me correctly has eaten up 3 entire threads. It's not "big", it goes beyond "huge", it might even go beyond "OMG!WTF!"
I want to second Shoshana about the issue of "likes." If you enjoyed the introductory post of a TL, please "Like" it. As an author, the only thing that makes my day more than a "like" is when readers post their appreciation of the story or provide constructive feedback.
Something I have noticed with TLs over on the ASB section (I split my reading time between pre 1900 and ASB, avoiding general chat like the plague), if you're a writer and you release a chapter each week or even less often, you should probably expect that your readers won't be quite as active or participatory as the writer dropping three or more chapters each week. Many readers like binge reading, and an author who has 10 or more chapters each month will produce a lot more content for his/her fans to consume than then writer who produces 3 or 4 each month.
Something else for writers to consider, and I admit this is a little gamey. But if you know your next chapter is a few days away, and you're about to fall off the 2nd or 3rd page, ask a question of your readers, something that is relevant to your TL or research. In my own TL, over on ASB, I knew I was going to be writing a chapter on a US presidential election a couple of chapters out, so I sought feedback about what the readers thought. It kept my thread on the first page, so that new readers could find it and also allowed me to tap the knowledge of my readers, who in many cases, are smarter than me. Don't just bump your TL, the mods do not like that, no, the purpose is to engage your readers and seek feedback.