Sounds like you might confused a little if you were thinking that the delay was when it totally cut all power... and thus 10 sec into the hibernate process it would just cut the power.... was that right?
I have mine on the default (10 sec) and it works fine. If you want the computer to stay on you can just wire in a switch on the IGN line to keep +12v on it or after you turn the car off just turn the key back to the ACC position within the 10sec and that'll keep the OPUS powered up.