Meanwhile, Karen Pence "wouldn't so much as say hello to Trump," Michael Lewis, the author of "Moneyball" and "The Big Short," wrote in a Guardian long read based on several interviews with Trump insiders and published Thursday.
I guess "long read" just refers to something that takes long time to read. But I'm not sure if it's accurate.
I know the word meaning of 'read'. What I am unsure is if the phrase "long read" is a set/idiom, which I am not aware of. That's the reason why I asked. If it just means the sense of its literal meaning, then it's fine. I just want to get it accurately.
The full source.