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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.
A lap can be either 25 meters or 50 meters. In the Olympics and major National events they swim 'long course' events which means the pool is 50 meters in length. However, there are still short course swim meets like 'Fina' and the pool is only 25 meters.