Apologies if this is a really stupid question. I'm driving to Spain in a couple of months and will be dozing in the car for a few hours on the way. All my previous vehicles have had a normal ignition key, so when I stopped to sleep and turned it off it was fully off. With my A4, the car always seems to be awake when I'm in it with the key. The radio works as does the MMI screen and various other functions. Is there an amount of time after which it would fully shut down?