@lentenmass It's amazing when you think that even letters like Corinthians where really just that: one letter that was likely read in one go by the receiving Church.
Yet, in our Church we are just about half way through a series on 1 Corinthians that I don't even remember when we started anymore 😆
(not suggesting there isn't also immense value in detailed study and sermons - but you do get a different perspective when you read large chunks in one go)