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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.
1,500 meters equals a mile, which is 15 laps (or 30 lengths) in a 50-meter pool and 30 laps (60 lengths) in a 25-yard/meter pool. 5 x 200 means you swim four laps in a short-course pool five times. 3 x 500 means you swim 10 lengths in a long-course pool three times. And so on ... As for clock reading, any good pool will have pace clocks on either end of the facility within easy view.