The PAR timer starts automatically when the first assignment is made and gets automatically reset once you've completed a PAR check that includes all units.
You can configure the PAR timer between 5 and 40 minutes. The default is set to 20 minutes.
From any screen, tap the settings icon in the lower left corner of the screen. Tap PAR time to expose the selection window for PAR timing. Select the desired time interval from 5 to 40 minutes. Tap Save.