A 2020 scientific study by Brian Roselle and Kenneth Scearce in the journal titled "Association for Crime Scene Reconstruction" analyzed the conscious reactions of several witnesses (including JFK and JBC) to the sounds of the first shot and determined that it occurred at hypothetical "Z-124," i.e., half-a-second before Zapruder resumed filming at Z-133. This means that Oswald took 10.2 seconds to fire all three shots in the echo chamber known as Dealey Plaza.
Funny how nobody noticed that it took that long.
Even more odd is how most ear-witnesses, who were generally in agreement and correct about the number of shots (3), said that the last two shots were close together ("there were two more in rapid succession"; "two more reports followed in quick succession"; "they were very close together"; "two real fast bullets together"; "The second and third shot was pretty close together"; "it was the first, and then a pause, and then the other two were real close.";"two very close together"; "the next two was right close together"; two more shots fairly close together;"five and one-half seconds was taken for all three shots"; "after the first shot there was a pause, then two more shots were fired close together.”; "The second two shots were immediate --- it was almost as if one were an echo of the other"; "then the third shot came very, very quickly, on top of the second one”.