PowerUp 3.0/Dart can fly between 5 to 10 minutes on a full charge depending on the airplane design, flying conditions and piloting maneuvers. Larger wings will require less thrust and will increase the over all flight duration. Ambient temperature and flying altitude will all have an impact on the over all fight duration. Expect reduced flight time also on old, worn-out modules.
For a perfect flying experience it is best to charge one module while you fly the other.