Honestly, how do you even remember a tenth of what you've read? The closest thing to your Everest I've read is Destiny Disrupted, coming it at a comparatively measly 18 hours. Most history books have an above average amount of names, places and events, such that even with DD I don't think I remember most of it. Let alone with something that's thirty times the length, while driving a bike, through Los Awfulnes, listening at 1,5x.
There's this style of history pedagogy whereby rather than go through it chronologically, you go through the culture chronologically then the art chronologically then the religion chronologically etc etc etc so you end up hearing the same names over and over again. I bitched about it here but it makes a lot of sense when you're blowing through a thousand pages covering 100 years. I'm listening at 1.8x.