That depends on the depth of the 9" pans. Volume of 9x1.5 pan is 6 cups, volume of 9x2 pan is 8 cups whereas volume of 9x13 pan is 14 cups. If the batter depth is changed the cooking time will need to change; a deeper batter will require longer time a slightly lower temperature, a shallower batter will require shorter time and slightly higher temperature.
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