NRT -LHR usually about 12hours 30mins, so NRT-AMS would be about 11:45. That means approx. 130,000kgs of fuel. Max. ZFW (without TOW restriction) is 276.7 tonnes and Max. TOW 394.7 tonnes, i.e. approx. 118,000kgs of fuel available. So, the ZFW i.e. load would be restricted to allow a non-stop flight. Unless, of course, NCA have the ERF variant. Most freighter loads on the 747-400F are volume restricted rather than weight.(Light parcels taking up the same volume as heavy ones).