I would probably use a systemd timer instead because it has a feature that most crons don't. You can tell it to start the reboot 10 hours and 55 minutes after

I would probably use a systemd timer instead because it has a feature that most crons don't. You can tell it to start the reboot 10 hours and 55 minutes after the timer was started, regardless of time of day or other clock concerns. that means you don't need valid global time or anything to schedule it properly and it'll be built in to the already there raspberry pi os (and most other distros for the pi) so there's no new software to install or setup.