The amount of time it takes to reach pressure and the float valve to go up depends on the amount of liquid inside the cooker and the temperature of the food. The more liquid in the pot and the colder the food, the longer it takes the Instant Pot pressure cooker to reach pressure. If the Instant Pot has about 2 cups of liquid, it may take 10 minutes for the Instant Pot to reach pressure if the food isn't frozen. The Instant Pot can take 15 to 30 minutes if it has more liquid.