What if my party enters instance and goes afk for a while? Y'know to make sure we don't get less.
Or if someone joins in progress then decides to wait? To make sure he gets his max tomes.

I can see many problems and raging over such situations :x We just need more options to gain tomes, to spread out and avoid general (weekly) boredom. Speed runs, as a "thing", are never, ever, [in echoing voice] everrr going away from ANY MMO :x