Believe it or not, Medium actually published and promoted a full novel once. Of course, it was about the tech undustry. I have seen a couple others. But it is rare.
I had some success publishing my novel as a serial (before I self-published it), keeping parts to 7 minutes and under. Which seems to be the attention span of most Medium readers. I also published a new part daily (love that Medium scheduling feature.)
I am curious to know how a 300 minute read does. Hopefully, the Medium "continue reading" feature will work!