An enzyme-catalyzed reaction was carried out with the initial substrate concentration 1,000 times greater than the Km for that substrate. After 9 minutes, 1% of the substrate had been conveed to the product, and the amount of product was 12 mmol. If, in a separate experiment, one-third as much enzyme and twice as much of the substrate is combined, how long it would to take for the same amount (12 mmol) of product to be formed?