Earlier quoted context omitted.
Also, a 4 hour travel door-to-door on a plane means: * Half an hour to go to the airport * Half an hour passing security and waiting for boarding * 20 minutes between boarding and stable flight when you can start working on your laptop * One hour and 40 minutes when you can work cramped in a noisy environment with terrible air quality * 15 minutes descent and landing * 15 minutes deboarding and getting out of the air…
> Half an hour passing security and waiting for boarding Only 30 minutes sounds optimistic. You also didn't count the time to recover luggage. I've seen people bringing huge suitcases on high speed trains. They couldn't take them in cabin on a flight. Planes are good past the 2 hours flight time IMHO, or across countries where there are no interconnected high speed networks (I'm writing this with Europe in mind.)
In the rare occasions I checked luggage I'd arrive about t-45 and have a beer in the lounge.
Never missed a flight. To get to west london it was far faster than the train and tube, although most of the time I was changing at Heathrow onto a longer distance flight.