Does anyone know how to change the runtime from 10 to 15 min. on the Ford Remote start?

 

It depends on what system you've got. The option banks vary; typically, hold down the brake pedal with the key on and the engine off. Hold down the programming button until the horn chirps three times, then release the brake and press the programming button to advance to the appropriate option bank, then press the brake pedal to scroll through the options until you get to the start timer.