I don't think it's just the 10% of the city and 100 men... it's more like, if the town square is empty and just one of your men set foot on it, it's yours if that man stays there for 3 minutes. I know because I had my in-city units all off chasing some routing peltasts along the walls leaving the square unoccupied, and that peltast unit (only 5 men left) just routed back to the Town square, stopping the timer. I had to restart it again by killing those 5 peltasts, but then after that, there really wasn't a need to. Usually the timer doesn't matter since if your clear the town square so it's occupied solely by your troops, the AI ensures that it means you've already killed everyone within the walls since the last unit will always garrison the town square in the imperial campaign.
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