While the cook time for pressure cooking baby carrots is only 3 minutes, it takes the Instant Pot several minutes to heat up enough to come to pressure. The total time to cook the carrots from the time you turn on the Instant Pot is closer to 10 or 15 minutes. The cooking time will also depend on the size of your carrots. If you use whole carrots and slice them thinner than about an inch, you may only need to set the cooking time for 2 minutes. If the carrots are not tender enough after 2 minutes, you can continue to cook them on the "saute" setting until they are cooked to your liking.