EDTO Diversion Time
Potentially a B777-300 could be 5hr 39mins away from the EDTO alternate.
Area of operation is determined by 240 minutes at two engine cruise speed...
240 mins at 490 kits = 1960 nautical miles
1960 nm at ETP1D speed (Single engine depressurised @ FL140 = 5hrs 39 mins
I don't know if there are any potential routes where this might apply but....