"Fox has announced a goal of reducing ad time to two minutes an hour by 2020." Is this correct? Two minutes of adverts per hour? Or is this a typo from NYT and

"Fox has announced a goal of reducing ad time to two minutes an hour by 2020." Is this correct? Two minutes of adverts per hour? Or is this a typo from NYT and 'by two minutes'. Two minutes of ads would be 4 slots an hour, they'd have to increase prices by ~7x per slot to make the same amount of money.