I'm at the end of the Orcs chapter and I have the 3503 version of the event. My activity level is such that I usually put on 24 hour productions every day. I'm expecting to get about half way through this event. Compare that to the usual events we get, both small and large, which I always manage to complete in plenty of time.
I'm not overly concerned that I won't complete this event, as the end point rewards aren't anything special, yet the midpoint rewards (spell fragments) are something I'm quite keen on. If this is the final version of this type of event, then I'd consider it ok but nothing special, however I suspect it's more of a test and future events might be better. Bonus, if this turns out to be a test for a new format for the Adventure quests that would be fantastic.