I put the Stormlight Archive 1-3 (as one book on kindle) onto my reader and after a solid week of camping with at least a few hours a day it says I'm 16% of the way in. Holy F this is long. I check goodreads and it says 3800 pages.
It's compelling, though. There are times when I want to know what's going on in another arc and they take a little while to get there, but from a character receiving ethics lessons while contemplating betraying the teacher to a powerful lord contemplating whether he's receiving divine guidance or going insane, I never quite know what anyone is going to do. The cultures are weird (though you can see parts inspired by various cultures around the world and historically), and the magic is building out nicely.