He had literally zero idea where he was. Or how long he'd been here. He remembered falling from a great height, but then he just stopped. It wasn't a landing as such, more like getting stuck on the fall. Harry spent a good while simply looking around at this unending whiteness, before he realised he could move. So he tried, first at walking pace, before moving to a brisk jog, then upgrading to a full sprint when he panicked slightly at not getting anywhere. It didn't help. He tried lots of different directions, all with the same result.