It seems like Dominate can be a pretty fast acting power, depending on the target's Discipline and Conviction.
Let's say a generic Black Court (Good Discipline, +3) is up against a normal human (Discipline and Conviction of 0). On the first round, he rolls to establish eye contact (Maneuver) and on an average roll (net +3) succeeds with style. He gets a +4 Bonus on the next round.
The next round, the Black Court Vampire rolls for domination. On an average roll (net +3), after he adds the maneuver bonus, he inflicts 7 points of mental stress.
The human has to take a Severe consequence and loses 1 point of stress. The human can elect to concede immediately, and yields to the vampire's control.
Not bad for two rounds, assuming average rolls and no Fate Point expenditure.
If the human didn't yield, the BCV could continue his attack, this time tagging the Severe Consequence for a net +5 effect. The human would have to take a Moderate Consequence and lose his second mental stress box.
If he didn't yield at this point, next round he is taken out completely and can be made into Renfield.