Well since anywhere from 6-9 minute mile is good (under 6 is no less than amazing; more than 9 minutes is not so good) 6 x 2.5 = 15, 9 x 2.5 = 22.5. So to answer your question i would say, technically, anywhere around 20 minutes would be adequate. I personally think that because of exhaustion 20-25 would be good, under is very good more is ok. I can run 2.5 miles in around 20 minutes.
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An acre is a measure of area. A mile is a measure of distance. Assuming you are running around the perimeter of the 2.5 acre plot, the answer would depend on the configuration of the acre. A 2.5 acre square (which has the shortest possible perimeter of any configuration) would have a perimeter of 440 yds. Since a mile is 1760 yds, that would mean you would have to run around the square 4 times.
A mile around a standard 400m track is 4 laps. So you need to run 6 laps around the track to cover 1.5 miles.