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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.
You may not be able to swim for a full workout (30 minutes or longer) right away, but you can work your way toward a longer workout. Start slowly, with 5-10 minutes of laps. Outdoors: Yes. You can swim in indoor pools, too.