I'm trying to find out how to work with the Teensy 2 on a lower power project. Ideally I'd like to put it into a deep sleep/hibernation for about an hour, at which point it will wake up.

I've noticed the Snooze library, but this is not compatible with the Teensy 2, and also seems like any of the Arduino deep sleep commands don't work.

There's some info in https://www.pjrc.com/teensy/low_power.html, but a lot of this is "TODO", and I think it only have information on sleep using interrupts. There's also mention of using the "idle" mode on there, and it mentions "Easy, since the normal timekeeping will wake up automatically." - but I'm unsure what this refers to - how would I wake it up again after a set duration of time?