The M2 only has preset limits. The closest to what you want is what I use. It is called "Taxi" mode or something. 30seconds it goes to standby. Then after 2 hours, it pulls the plug.
The M2 supplies no power to the mobo after the "plug is pulled" 2hrs later. Not even usb devices. So no power drain. Well really, a very little amount for the M2 itself.