Planned five days out, and we were still running for the train with the flight under two hours away. My little sister was studying abroad in London, a few colleagues were in the same weekend, and it is six and a half hours direct, which makes the maths easy.
The weekend ran on the city's own energy – long walks between neighbourhoods, and the hardest workout class I have ever taken, during which I fell off the rower.
Seventy-two hours is a real trip if you treat it like one.