" The second simultaneous thing Reacher was doing was playing around with a little mental arithmetic. He was multiplying big numbers in his head. He was thirty-seven years and eight months old, just about to the day. Thirty-seven multiplied by three hundred and sixty-five was thirteen thousand five hundred and five. Plus twelve days for twelve leap years was thirteen thousand five hundred and seventeen. Eight months counting from his birthday in October forward to this date in June was two hundred and forty-three days. Total of thirteen thousand seven hundred and sixty days since he was born. Thirteen thousand seven hundred and sixty days, thirteen thousand seven hundred and sixty nights. He was trying to place this particular night somewhere on that endless scale. In terms of how bad it was. Truth was, it wasn’t the best night he had ever passed, but it was a long way from being the worst. A very long way. "

― Lee Child , Die Trying (Jack Reacher, #2)