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A typical workout for a series competitive swimmer might be between 8000-10000 yards in a 2 hour period, or 320-400 25-yard laps in 2 hours. A beginning obviously will be substantially less.
Freestyle races are the most common of all swimming competitions, with distances reaching 1500m (1650 yards). The stroke used almost universally in freestyle races is the front crawl, as this style is generally the fastest.