Hi
assuming a dry rwy with no failures and a GW of 60T at the diversion airfield...and not using the autoland feature on the machine..i would look at the required landing distance since it will give me a 40% safety margin in general
autoland/config full/dry rwy/autobrakes low/60T...2104m
actual ldg dist/no autobrakes............................810m
req ldg dist....................................................1350 m