The ABA routing number is a 9-digit identification number assigned to financial institutions by The American Bankers Association (ABA). This number identifies the financial institution upon which a payment is drawn. Routing numbers are sometimes referred to as check routing numbers, ABA numbers, or routing transit numbers (RTN). Routing numbers may differ depending on where your account was opened and the type of transaction made.
Scuba organizations say recreational divers shouldn't go below about 130 feet, but one Egyptian diver recently ventured a bit deeper -- going more than 1,000 feet below the ocean surface and setting a world record in the process.
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.