Originally Posted by
LarryJ
About 2,500nm at the most, and only that for short periods.
If the shortest route is taken, more than 3 hours for a significant period in the middle of the route:
A map from the Great Circle Mapper - Great Circle Mapper
A map from the Great Circle Mapper - Great Circle Mapper
of course the option always exists to fly a longer (more northerly) route to reduce the max diversion time.