Another anecdote. When I was 19 I did a quick conversion job for a company. I'd take an early train down on a Monday morning, worked about 20 hours a day wit

Another anecdote. When I was 19 I did a quick conversion job for a company. I'd take an early train down on a Monday morning, worked about 20 hours a day with just a quick nap each night on the reception sofa, and then a train home of Friday. I did that for two weeks, I was shattered but got through it OK.