Sad thing is that it ain´t getting better after 12 atmas.

I have now completed 3 books ( 1500myth each = 4 hours myth farming each )
Add that to the 1-2 hours waiting for a certain FATE that you need for the book.
(You need 3 FATEs for each book and each of those is kinda rare, because SE wants us to waste as much time as we can)
You also could grind more FATEs and hope that it appears faster this way but I bet noone is going to touch any more FATEs unless they need to.

So I need 9000myth for my last 6 books = 24 nonstop farming for myth + doing the chores for the books until my animus is complete.
Also 1500 tomes of sold I think?

Well this really isn´t fun anymore.
And what do you get for 3 Books? In my case all the work was for 6 MND.
Tho I really needed more mind after loosing all of it due to grinding like a insane person.

At least gives us the means to upgrade our alt´s relics or let us keep the books >_>