When you wake up, how long does it take for your brain's "OS" to "resume from hibernation/sleep-mode"?

I mean like: How long does it take before you brain goes: oh shit, I exist... I remember, I am a living thing, human, my name is [■■■ ■■■] and my current location is [■■■] and oh shit I'm late for [work/school/event] (or if its weekend, its like: oh... nothing's happening, life is boring)

Like you know what I'm saying, like the Terminator HUD thing after it reboots and it takes a few seconds before it can identify a target and then recognize its mission... that type of thing.

Or do you wake up and within 1 nanosecond realize the state of your existence?