I agree fully with Tim...if employing "edge rule" anything beyond 0.125" can become problematic...

However, with "line rule" we have used post over 3 meters (~10') that are "out of wind" by as much (or more) than 50 mm (~2") with no ill effect at all...Some very twisted posts (beyond 60mm of wind) can have an unusual aesthetic affect and still achieve very tight and solid joints.