Shot clock timing.

I noticed a shot clock at the 2010 World Cup.My question is,when does the shot clock start?
As mentioned above, it's usually when the last ball stops moving/spinning but more generally it is when the player is free to make a shot. If a player on the adjacent table is interfering with the position of the shooter, the timekeeper will delay starting the clock. There is probably also a delay if the cue ball is or appears to be frozen.
 
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