If it helps, data from my Regular save: I'm now in year 2028, after 13 days and 5 hours of game time. That's just around 20 hours per season. I believe I'm not the fastest nor the slowest FM player out there, but it is also true that I could take a lot more time with this save, so I'd say the average should be around 25, 30 hours per season, if the manager is really into the game.
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