It is about 644 lengths . Up and back 322 times. somewhere on the last lap you cross the 10 mile mark. I worked this out by first working out what 10 miles is in meters and then dividing 25 meters into that. there are about 1.609344 kilometers to each mile. 10 miles is 16093.44 meters.
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Well, it would take me about 12 minutes to swim 250 meters. But, my swimmer sons could do it in less than 4 minutes.
250 meters is not a competition distance, but at world record pace for the 200 freestyle (1:42), it would take just a bit longer than 2 minutes.