A340-500 has a fuel burn of around 5860 kg/h...
14h 15 min= 14.25 h
Holding 1500 ft 30 min= 0.5h
5% ERT= 0.7125 h
Alternate OMSJ 15 min= 0.25 h
Total Trip Time: 15.7125 h= 15 h 43 min
15.7125*5860kg/h= 92075kg
So the FOB would be around 92 Tons.
Hope this helps!
Regards,
Robini