Frank Gilbreth was an American pioneer of time and motion study. Two of his children, Frank Jr. and Ernestine, wrote about him in Cheaper by the Dozen (1948), which became a film in 1950. Their father buttoned his vest from the bottom up, because it took him three seconds instead of seven. He also found a way to cut seventeen seconds off his shaving time.
For a while he shaved with two razors at once, but he finally gave that up. “It wasn’t the slashed throat that really bothered him. It was the two minutes.”