The essay geekI have located this source

industry and/or academic sources that would show the average employment length for stockbrokers in US and of stockbrokers at Morgan Stanley US specifically.  I have located this source indicating a 4.3 avg length but I need official sources (governmental industry related e.g. FINRA SIMFA SEC or academic research papers or studies) that would back up this result or indicate a different value that I could quote.Thanks Violet Nov 18 2021