In the first week of the expansion Nov 28-Dec 4? Was brought up at a SoE Live player panel long after memories had faded and that expansion limited the amount of raiding you could do early in the expansion with Books. Fire and Fury - 5 hours
10.5 - 12 hours here (our normal 3 raid days). We did end about 30 minutes early a couple days, hence the range.
Charizard is at somewhere between 5and 10. TBH I haven't kept track but 3 days of 2-3ish hours, win a new raid and call it for the night =).
Dark Bane did 3.5 so far as we cancelled a raid for ppl to get xp instead. Launch isnt usually on our raiddays though like it was this year so we lost another night we'd have worked. the SL raid is definitely well-done, no one complained about dying without paddings bc it was fun, always a good thing.
My guild always takes the first ten days or so after an expansion releases off. No raiding to let people level and do group stuff.
RoI ~34 hours full expansion clear, including a night of re-clearing t1/t2 raids first killed on opening day.