How far can condor and other great birds fly without having to land once?

Question

Also, how many MPH without touching down?

Answer 1

Some birds can cross the entire Atlantic/Pacific Ocean without ever having to land once. They take advantage of the heat pockets by flying in circles. As the heat lifts them up to a desired height they then continue flying, as they slowly begin to descend they repeat the circular motion and so on and so on.

Answer 2

Depends on the air currents that they are flying in....