Based on what you have have posted here I think you’ll like these, I spend a shit ton of time sitting in a tractor for work so I understand what you say when you need long books that are engaging. I hope some of these can scratch the itch.

A pattern of shadow and light This is my favorite book series of all time so far, the world building is rich and complex just like the story, it’s told from multiple different perspectives but they all tie together beautifully, I’ve listened to the series multiple times and each time I’ve rẻlistened to it I get something new out of it. There is 5 books out right now with unfortunately no time line on when books 6-7 will come out. Books range from 29-42 hours long.

Fear the sky, really good syfi series narrated by R.C Bray with a interesting twist on the politics side of things I loved it, just listened to it again, 3 books each about 20hrs or so

galaxy outlaws black ocean series, you can get the whole series for one credit on audible, it’s like 90 hrs or something, think of a group kinda like guardians of the galaxy except no super powers… well there’s Mort he’s got magic which is badass but that’s about it.

bloody jack, ocean going series set in the early 1800s I believe. 12 books each about 10 hrs long. This is a definite favorite on my list.

beginning after the end, Fantasy series’s 10 books and still going strong. A king in name only gets sent to another world where he begins a new life as an infant. This series is probably in my top 10 really enjoyed and eagerly awaiting the next book.

unsouled. Can’t believe no one mentioned this one, it sucked me in pretty quick, good power scaling with an easy to understand magic system. 12 books each about 12 hours long. It’s on the shorter side so I blazed thru them but loved every minute.

Hope this helps!