"Contemporary Reminiscences" in Arts & Decoration, Vol. 26 (1927), p. 50
“If you act like you've only got fifteen minutes, it will take all day. Act like you've got all day, it will take fifteen minutes.”
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Monty Roberts 1
Horse trainer 1935Related quotes

The Common School Journal, Vol. V, No. 19 (2 October 1843)

As quoted in The Wilson Era; Years of War and After, 1917–1923 (1946) by Josephus Daniels, p. 624. Referenced in "Bartleby.com" http://www.bartleby.com/73/1288.html
1920s and later

Even a ten or fifteen minute nap in the middle of the day can be the equivalent of an hour and a half of extra sleep the night before, and it can raise your effective IQ by ten points.
Talks at Google (Oct 28, 2014)

source http://radiohead1.tripod.com/band/thomquotes.htm

“In the future everyone will have their fifteen minutes of fame”
When asked about this quote, he would corrupt it intentionally, including:
1968 - 1974