Patrol is an in-game feature that allows you to earn additional rewards in the background.

These rewards increase as you progress through the Worlds. You can earn up to twenty-four hours worth of rewards before you need to claim them to start patrolling again.

Once you have claimed the rewards, you will have to wait up to an hour before claiming them again, or if you prefer, you can use 'Quick Patrol' to get eight hours' worth of rewards instantly.