The most I've ever cooked in the Instant Pot was about 8 chicken thighs. Any more than that, and you start stacking them on top of each other, which will take forever to cook. If you have a lot of chicken to cook at once, make sure that your chicken thighs are all seasoned well before you stack them up in the Instant Pot. Then, add on about 2-3 minutes per extra lb of chicken that you're adding. This recipe calls for 2 lbs of chicken thighs and a cook time of 6 minutes. If you want to double the recipe and use 4 lbs of chicken, start with a cook time of 10-12 minutes. Check your chicken and add additional cook time if it's not done all the way through.