These are Airbus figures, and, may I add, are for in-flight and not pre-flight planning purposes.
Top,
Airbus made a statement yesterday saying that the airplane was within envelope and that in the given conditions, there was a 200mts runway margin for landing. This happend after the press contacted Airbus for several times. Unfortunantly, I could not find a web link of that statement.
for how long was the crew on duty prior to the accident?
Probably near maximum duty time (and I hope not above that...). Rosters are a serious issue at TAM, and due to the recent pilot shortage, we are working a lot !