You can always test things out using the Simulator feature. Plan your test flight, save it, and then run it connected to the aircraft using the Simulator.
It won't allow you to program any flight that exceeds 500 m above the takeoff location. Plan on the flight taking at least twice as long as is estimated if it is terrain aware.
To speed things up you should fly across the slope, not up and down it if possible. This will minimize elevation change, save battery and allow it to fly at the prescribed speed.