they should have enough to divert at any point, leaving them plenty of fuel for the divert (regardless of distance be it 10nm, or 1000nm), plus a 45 min hold, plus one go around - school boy stuff! - most people I have flown with also like to throw in an extra 10% of the total just for good measures too!
hats off too the FA's, but would love too know what happened too the chutes...