This obsession with QF's FFR is getting very old. No QF aeroplane planes to arrive anywhere with just FFR of 30 minutes. That's actual aircraft weight and varies each sector.
Many aircraft have an 'arrival allowance' as well to get from 1500' to the ground. It's 1 tonne on the 767. I've never burned more than about 600kg of it and even then it would have been a day where I dirtied up earlier than that and had to drive it in against a pretty stiff headwind.