How do I set the auto-off timer on the HFD360?

Tap the Timer icon to activate the auto-off function, then use the up or down arrows to select a run time between 1 and 18 hours in one-hour intervals. The LED display will count down and show the remaining hours, and the unit will shut off automatically when the time expires. Do not use this option if you want the unit to run continuously. (Page 3)