As noted in a prior post, the original May 29th criminal complaints against the four former Minneapolis policeman stated that Derek Chauvin held his knee to Floyd’s neck for 8 minutes, 46 seconds, a figure that became prominent in subsequent protests. However, on June 18th prosecutors admitted a mathematical error in calculating that time and said the actual time was 7 minutes and 46 seconds.
Subsequent prosecution analysis of the time-stamped body camera footages of the other three defendants indicated that Chauvin had his knee on Floyd’s neck “for at least nine minutes flat, but possibly for as long as 9 minutes, 31 seconds.” Thus, some prosecution filings have said the length of the restraint was “approximately nine minutes” and at least once as “more than nine minutes and twenty seconds.” 
Most recently a prosecution spokesperson said the length of time of the restraint would be documented by evidence at trial.
 Revised Length of Time for Minneapolis Police Restraint of George Floyd, dwkcommentaries.com (June 18, 2020) .
 Forliti (Assoc. Press), Prosecutors: Officer was on Floyd’s neck for about nine minutes, StarTribune (Mar. 4, 2021).