I'll defer to one of the great coaches who is in both the ABC/USBC and PBA hall of fame: John Jowdy.
In his book "Bowling Execution" he talks about the follow through saying that once the ball leaves your hand, nothing you do is going to change the ball motion. He does recognize, however, that the follow through is an important tool to ensure that everything before the release happens the way we want it to. In a free, pendulum arm swing, the follow through would be as high as the back swing. Mr. Jowdy recommends that you follow through at least to your break point - your hand is high enough so that in your field of vision, it touches the break point. Beyond that is fine, but short of that can lead to swing problems.
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