High water pressure is a concern for every homeowner. Here is a picture of a pressure gauge, which like its name, measures the pressure of the water coming into your house. We once bought a house that the pressure from the utility company was 110 pounds per square inch (PSI) at the hose bib (another name for it is outside faucet).
Sailing Yacht. Roughly 5,000 sailors cross the Atlantic Ocean by yacht each year in the winter months, with the voyage taking around three weeks. However, the record from Ambrose Lighthouse, New York, to the Lizard, UK, stands at a staggering three days 15 hours. Even if sailors cross as part of a fleet, participating in events such as the World Cruising Club's Atlantic Rally for Cruisers, they must be experienced and knowledgeable.
So I'd say it's at least 20 miles, and quite possibly as much as 50 if the conditions were perfect (not to hot, not too cold, etc.) Even moderate swimmers can cover that much with a follow boat to provide food and water, as in the recent case of a woman who covered a meandering 60 mile route to cross the English channel in 28 hours. With rest and food, you can get really absurd achievements, like swimming across the Atlantic Ocean.