It depends on how experienced you are as a runner.
Beginner: 3 miles or so (11-12 min/mile)
Average runner: about 3.5 miles (10 min/mile)
Fast: about 4.5 miles (8 min/mile)
Experienced XC runner: about 5 miles (7 min/mile)
Elite runner/really awesome XC runner: about 6-7 miles (5-6 min/mile)
Anything faster than 5 min/mile for 35 minutes is craziness. If you ran more than 7 miles in 35 minutes...you don't need to be asking whether that's a good number of miles :P
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The time it takes for a 35 year old to run a mile depends on what kind of shape he is in. For those in very good shape, they would be able to run a mile under 5 minutes.