According to the passage, how long did the average steamboat remain afloat?

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TOEFL Practice Test: Reading Passage 31 — practice the complete quiz, review flashcards, or try a random question.

Questions Below Refer To The Following Passage.     Steamboats were shallow-draft boats propelled by steam-driven paddle wheels. In the nineteenth century, they could be seen every day on rivers, particularly on the Mississippi River and its principal tributaries in the United States.     The development of the steamboat as a practical means of transportation began in America in 1787, but it wasn’t until 1811 that a steamboat was built specifically to travel along the lower Mississippi River. The boat, called appropriately the New Orleans, was built at Pittsburgh, Pa., for Robert Fulton and... Show more

According to the passage, how long did the average steamboat remain afloat?