A: 15 hours.
It seems as if I'm in Spain again, not London. I hear as much Spain-accented Spanish as UK-accented English, man purses are everywhere, and the city smells like Madrid.
The people in my hostel are fun and friendly, but being the new guy means there is no place to store my stuff and I'll be living out of my suitcases for the next week and a half. I'm all stocked up on food now, so today is all about the other errands: fixing my phone, buying an alarm clock, figuring out which bus/tube pass I need to buy. Busy busy busy.
Tomorrow, I'm going to try and be a tourist.