Upon research I have determined that the average 380-420 page YA novel, is in fact readable in one sitting. Also known as: I should probably go to the library soon.
To be fair, the font size was larger and the pages smaller than other books I've read. But this happened three times in the past three days, so it might not be a coincidence.
I read Oathbringer chapters 105-ending (including the final set of interludes and the epilogue) in one sitting. (I fell asleep after 2:30 in the morning.)