Depending on the variant and engine combination, it could carry a pretty good load for nearly 10 hours.
Example: RR powered A330-300
MTOW - 230,000
MZFW - 173,000
BOW - 121,000
Full payload - MZFW-BOW=52 tonnes (314 pax * 90 kgs = 28,260 kgs) which leaves room for about 23 1/2 tonnes of cargo.
Max Fuel - MTOW-MZFW=57 tonnes
Average fuel burn at this weight, with these engines, average over ten hours = 5385/hour
Alternate = LAX - 2700, plus 600 for G/A = 3300
Reserve fuel for 30 minutes = 3000
Fuel for trip = 50,700 / 5384 = 9:40 hours
The numbers seem to work and include capacity for a good lot of cargo.
Last edited by PappyJ; 13th May 2013 at 20:41.