Right. I usually hit 15-16 in a FULL ON sprint. Never been professionally clocked but used a stopwatch and I'm not bragging. That's my breaking point that lasts about ten seconds.Maybe on an adrenaline rush, like running for your ******* LIFE, you would be able to keep that up for a full mile.. and you'd most likely vomit when you snapped out of the rush. Like why even brag about speed like that. Who cares? Go race someone lol

Law of diminishing returns.

Average high-school sprinters run 100 meters in 14 seconds. Average Olympic sprinters run it around 8-9 seconds. Those 5 seconds are a huge jump. Meanwhile the jump from 19 seconds to 14 is not that much.

6 minute miles are tough, but every second shorter is exponentially more difficult.

That being said, are you sure it's not an 8 minute mile?
Running 7.5 mph doesn't seem as unfeasible as running 10 mph

Last I checked, a passing score for Marine officers is 3 miles in under 22 minutes. Dunno about enlisted.

Don't quote me here, but from what i read its 18 minutes or less

18 min for 3 mi is full marks. 6 min is quick but not crazy or even too terribly hard.