“An artisan busies himself with his work for three hours each day and spends nine hours in study.”
Treatise 3: “The Study of the Torah,” Chapter 1, Section 12, H. Russell, trans. (1983), p. 52
Mishneh Torah (c. 1180)
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Maimónides 180
rabbi, physician, philosopher 1138–1204Related quotes

“Lose an hour in the morning, and you will spend all day looking for it.”

(Haywood variation) Eight hours of work, eight hours of play, eight hours of sleep - and eight dollars a day!
Roughneck, The Life and Times of Big Bill Haywood, Peter Carlson, 1983, page 147.

“I study chess eight hours a day, on principle.”
Attributed in: David Hooper, Kenneth Whyld (1996) The Oxford companion to chess. p. 8.

“It is not the most pleasant employment to spend eight hours a day in a counting house.”
Book II, Chapter I, On the Progress of Wealth, Section IX, p. 403
Principles of Political Economy (Second Edition 1836)

“Six hours in sleep, in law's grave study six,
Four spend in prayer, the rest on Nature fix.”
Translation of lines quoted by Coke. Compare: "Seven hours to law, to soothing slumber seven; Ten to the world allot, and all to heaven" - Sir William Jones.

Song 20: "Against Idleness and Mischief". Parodied by Lewis Carroll in Alice's Adventures in Wonderland.
1710s, Divine Songs Attempted in the Easy Language of Children (1715)