As of today, the longest single game of Football Manager has officially been recorded by the Guinness World Records committee.
The record now belongs to Pawel Sicinski, a UEFA Grassroots C football coach in Poland. Specifically, Sicinski spent a total of 416 years and 134 days in a single game. According to the folks at Guinness World Records, he played from January 4, 2018 through May 18, 2434 in-game, with only 260 days off.
New record: Longest single game of @FootballManager - 416 years and 134 days.Pawel played on Football Manager 2018 and managed teams from the 4th January 2018 up until the 18th May 2434 and only took 260 days off!
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