Option to enable automatically rebooting the device when no profile has - been unlocked for the configured period to put the device fully at rest - again, which is enabled by default at 18 hours. This can be configured at - Settings > Security > Auto reboot.
+GrapheneOS provides an auto-reboot feature which reboots locked devices after + a set period of time to put data at rest. A countdown timer is started each time + the device is locked, and the device will reboot if a successful unlock doesn't + occur before the timer reaches zero. Unlocking any profile cancels the timer, + not just the Owner profile.
+ +The timer is set to 18 hours by default, but can be set to values between 10 + minutes and 72 hours, or turned off.
+ +This feature doesn't apply when the device is in "Before First Unlock" state, + meaning that it will not lead to the device continuously rebooting, as data is + already at rest.