In 1976, the owners approved the use of two 30 second play clocks that noted the official time between the referee signaling the ball ready for play and the snap. Prior to that the time was monitored by the officials, I believe in particular the field judge.
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In 1983 a 30 second shot clock was used in ACC league play. Joe Cowan
Yes. If the team kicking the ball does not kickoff before the play clock has expired.
35 (when I got the 2 answers that didn't agree - this one saying 35 and another saying 40 seconds, I went to the NFL site, and found the answer easily. It is 40 seconds.) Once the whistle blows to end a play, 40 seconds are place on the play clock and the play clock begins to wind down.
The coach to quarterback communication shuts off with 15 seconds left on the 40 second play clock.
1998