There is no problem finishing 60 quets its fine okaj cool.
UNLESS: if the quests gonna be utter garbage aka hard, if the ht would actually "work" as intended (not that you wait half a day for update or that the kills don't count - it drives ppl crazy)
But in future there should be some room like 5-10 more quests so that we have some room to work with, won't happen, it just would be nice.
In general the rewards stay so the event is a nice addition.