We don't need to wait for the chains to be fully set... as soon as the down box is in place, we can start the clock. If we know it's 1st and 10 at the A-34, everybody knows the line-to-gain is the A-44.
My R usually waits till I spot the ball (as the U) before starting the clock, but will sometimes start it a bit earlier than that... usually in situations where it's taken an unusually long time to get the ball spotted.
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