Duration PINs are valid within the duration of time specified by the start date/time and end date/time.

Tap the second tab on the bottom of your Lock's screen to go to the [Access] page

Tap [+ Access]

Tap [Duration PIN]

They come in two varieties:

1. algoPINs (Generate PIN remotely and use within 24 hours to activate)
2. Custom PINs (Generated via Bluetooth and requires you to be within Bluetooth range of the lock to generate the PIN)