Interesting. Of course I knew of the SS recreation but this is the first time I saw that reporters were allowed in. I believe the CBS reporter said his name was Lou Wood. He sounded a lot like Cronkite. I noted he said the three shots were fired in under 10 seconds. Apparently the Six Seconds in Dallas myth had not yet been formulated.
Related to what John just said above, in the 11/29/63 phone call between Lyndon Johnson and J. Edgar Hoover (linked below), Mr. Hoover made this statement to LBJ (at the 9:15 mark):
"Those three shots were fired within three seconds."
Now, as I think some more about the seemingly absurd "within three seconds" remark made by Hoover, I suppose it's possible that what Hoover meant to convey to LBJ is this:
"[Each of] those three shots [was] fired within three seconds [of each other]", which would mean about a six-second shooting timeline in total.
But Hoover's statement as it was spoken certainly makes it sound as though the FBI (as of November 29th) thought the entire assassination, from start to finish, took only three seconds (at most). ~shrug~
More of the FBI's early mistakes relating to JFK's assassination are discussed in my article
HERE.