According to this, it was 2 1/4 seconds:
https://www.ratical.com/ratville/JFK/PG/PGappD.html
The short answer is no.
One second is equal to 18.333 Zapruder frames.
One second divided by 18.333 equates to 0.0545464462990236 seconds per Zapruder frame.
30 Zapruder frames multiplied by 0.0545464462990236 seconds equates to 1.636393388970709 seconds.
The human response time to external stimulus is quicker than 1.636393388970709 seconds.
Sorry, the emperor is naked. Why keep insisting that he has new clothes?
One, JFK's waving motion freezes in Z200 at the latest.
Two, there is no way on this Earth that JFK's visible Z225 reaction could have been in response to a Z224 hit. That is sheer fantasy and delusion.
Three, if we discard the magic-bullet myth, and if we assume that Connally was hit as late as Z239, as the WC absurdly posited, and if we assume that JFK was hit at Z199 and magically began freezing his waving motion 1/18th/second later, this would allow only 40 frames to work the rifle's bolt, aim, and squeeze the trigger. 40 divided by 18.3 is 2.18 seconds. In the WC's rifle test, the three Master-rated riflemen missed the head and neck area of the target boards 18 out of 21 times, and their second and third shots were the most inaccurate, and two of them took 6.75. 7.0, and 8.25 seconds in three of the shot series.
The FBI firing test with the alleged murder rifle puts the 2.25/2.3 minimum firing time in serious doubt, as WC attorney Wesley Liebeler explained in an internal WC memo that was never supposed to see the light of day:
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As I read through the section on rifle capability it appears that 15 different sets of three shots were fired by supposedly expert riflemen of the FBI and other places. According to my calculations those 15 sets of shots took a total of 93.8 seconds to be fired. The average of all 15 is a little over 6.2 seconds. Assuming that time is calculated commencing with the firing of the first shot, that means the average time it took to fire the two remaining shots was about 6.2 seconds. That comes to about 3.1 seconds for each shot, not counting the time consumed by the actual firing, which would not be very much. I recall that chapter 3 said that the minimum time that had to elapse between shots was 2.25 seconds, which is pretty close to the one set of fast shots fired by Frazier of the FBI.
The conclusion indicates that Oswald had the capability to fire three shots with two hits in from 4.8 to 5.6 seconds. Of the 15 sets of 3 shots described above. only 3 were fired within 4.8 seconds. A total of five sets, including the three just mentioned were fired within a total of 5.6 seconds. The conclusion at its most extreme states that Oswald could fire faster than the Commission experts fired in 12 of their 15 tries and that in any event he could fire faster than the experts did in 10 of their 15 tries.
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Now, if we get real and acknowledge what the Zapruder film clearly shows, we will admit that JFK was hit no later than Z190 (and probably at Z186), and that Connally was hit at Z234 (Connally himself chose Z234 as the moment he was hit). This gives slightly more time (four to eight frames) to reload, aim, and fire, but (1) it means that at least four shots were fired because we have to account for the Tague curb shot and wounding, and (2) it leaves no bullet to explain what knocked JFK visibly forward from Z226-232.
The Z226-232 reaction, second only to the head shot, is the most visible, obvious reaction in the film. JFK is knocked visibly forward and his forearms are flung upward, obviously in response to the impact of a bullet striking his back. The WC and the HSCA ignored this dramatic reaction, but it is one of the most readily apparent events in the entire film. This shot probably hit JFK at Z224 and was a separate bullet from the one that hit him at Z186-190.
Finally, even assuming that the alleged lone gunman had 48 frames to reload, aim, and fire, that still only gives him 2.62 seconds to do so. Again, two of the three Master-rated riflemen in the WC's rifle test required 6.75, 7.0, and 8.25 seconds in three of the shot series. If we assume that the alleged lone gunman was the unskilled and unpracticed rifleman Lee Harvey Oswald, the single-shooter scenario becomes downright ridiculous, given that the slower times of the Master-rated riflemen were done against stationary targets and from an elevation of only 30 feet (vs. Oswald's alleged feat against a moving target from 60 feet up).