The throwin count ends when the thrower releases the ball. So, the speed of the rolling ball is irrelavent.
In fact, it is possible for the ball to come to a stop on the court for a very long time with no one touching it without a violation since the backcourt count and the clock (or the shot clock in levels that use one) do not start until a player touches ball (clock starts) or controls the ball (10 count start if in backcourt)
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