Passage: In 1743, Franklin founded the American Philosophical Society to help scientific men discuss their discoveries and theories. He began the electrical research that, along with other scientific inquiries, would occupy him for the rest of his life, in between bouts of politics and moneymaking.In 1747, Franklin (already a very wealthy man) retired from printing and went into other businesses. He created a partnership with his foreman, David Hall, which provided Franklin with half of the shop's profits for 18 years. This lucrative business arrangement provided leisure time for study, and in a few years he had made discoveries that gave him a reputation with educated persons throughout Europe and especially in France.

Question: How long were the financial proceeds of the shop split?
18 years