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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.
Since you asked this in the swimming forum, I am assuming you are asking how many yards are in a swimming mile--meaning the competive race (the mile). The answer is 1650 yards, or 66 laps. Why it is not 1750 (to be closer to the actual mile 5280 feet/3, or 1760 yards), I have no idea. That is just the way it is.