Advanced Stats show that Harris is possibly the Bucks' best player, and he's only getting 12 minutes per game. His stats:
Harris (per 36 minutes) - 18.8 pp, 7.3 rp, 1.1 sp, and 0.9 bp, shooting .565 TS% (second to Dunleavy's .574).
So Harris has only appeared in 20 games, so we don't know enough to say we should expect this from him every night. We do know enough to say that he should be getting at least 25 mpg until he proves otherwise.