When I was doing Animus (when it was new) it took 9~12 hours per book. It was pretty awful.

Bray was 3 hours
Mobs was 30m~1hr
Dungeons were 2~3 hours (low level players are slow)
Fates varied from 3~6 hours (I was 2/3 on fates and I was camping one in Southern Thana that took 5 hours to spawn =_=)

But it's been said it's nerfed so maybe the second time won't be so painful.