Skeptics have argued that expert marksmen could not duplicate Oswald's shooting in their first try during re-enactments by the Warren Commission (1964) and CBS (1967). In those tests, the marksmen attempted to hit the target three times within 5.6 seconds. This time span has been heavily disputed. The Warren Commission itself estimated that the time span between the two shots that hit President Kennedy was 4.8 to 5.6 seconds. If the second shot missed (assuming the first and third shots hit the president), then 4.8 to 5.6 seconds was the total time span of the shots. If the first or third shot missed, that would give a minimum time of 7.1 to 7.9 seconds for the three shots. Modern analysis of a digitally enhanced Zapruder film suggests that the first, second, and final shot may have taken 8.3 seconds.