The cooking time varies depending on the type of ribs you are using. Baby back ribs take 25 minutes at high pressure while spare ribs, which are a little meatier, take 35 minutes. But you will also want to account for the time it takes for the Instant Pot to come to pressure (typically around 10-15 minutes) and time for the pressure to release at the end. All in all it's usually between 45 minutes to 1 hour total. Not bad considering ribs in the oven, smoker, or slow cooker all take over 3 hours!