Well, like most things, it all depends. On the mode of transport, whether you get a seat, and most importantly your state of mind. Personally, when I travel back from London to Newbury I absolutely don't check the train times from Paddington. That way I don't stress about the tube getting me there on time or the slow amble of the people in front of me. And if I miss a train, I find a seat and read for an hour.