What is the longest distance swm?

Answer 1

The longest distance which is swum competitively in a swimming pool is 1500m (60 lengths of a 25m swimming pool or 30 lengths of an Olympic-sized 50m swimming pool).

However, athletes which train at a high level (the likes of Michael Phelps, Ryan Lochte, Melissa Franklin and Ian Thorpe to name just a few) can easily get through 50,000 - 80,000m per week.

In open water swimming, the longest distance swum is 25km (25,000m), but again the athletes training for these events will do many metres more in training - around 50,000 - 100,000 metres per week.