We've heard that iOS 18.1 is using a 4 day timer for auto-reboot after the device is locked, which is similar to the 72h default we used before moving to an 18h default. Our users can configure it between 10 minutes and 72 hours (or disabled) based on their tolerance for it.
When we proposed it to Google in January 2024 as a standard Android feature, we suggested starting with 1 week. Android has a lot more tolerance for adding user-facing configuration so they could expose the same functionality we do just with a less aggressive default for it.