The longest period of fasting was fixed by his impresario at forty days, beyond that term he was not allowed to go, not even in great cities, and there was good reason for it, too. Experience had proved that for about forty days the interest of the public could be stimulated by a steadily increasing pressure of advertisement, but after that the town began to lose interest, sympathetic support began notably to fall off; there were of course local variations as between one town and another or one country and another, but as a general rule forty days marked the limit.
—Franz Kafka, “A Hunger Artist,” trans. Willa and Edwin Muir