I believe splitting a long post would benefit everybody, as long as you have a splitting point. Sometimes you just have to have a long post, to get your point across. I don't check to see how long a post is before I start reading, but I have had to come back to many to finish them. I just put them in my feed by resteeming. Sometimes I have to wait to upvote a post until my VP replenishes. 😎
Yeah, I've left some posts open in my tabs to read later, but I don't always follow through. But I don't always read through a series, either. On the other hand, the series have more opportunities for me to upvote the author.