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Estimation question

How many hours would the Amazon River need to fill the whole of Loch Ness in Scotland?

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The answer

9.7 hours

Just under 10 hours, one working day, and all of Loch Ness would be full.

How to get there

  1. Amazon: at least about 215,000 m³ per second
  2. Loch Ness: about 7.5 km³ = 7.5 billion m³
  3. 7.5 billion ÷ 215,000 ≈ 34,900 seconds
  4. ÷ 3,600 = about 9.7 hours

Source: Wikipedia: Amazon River, average discharge about 215,000 to 230,000 m³ per second; Loch Ness, water volume 7.5 km³ (as of October 2026)

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