Question: how long to cook 2 pounds of chicken in instant pot?
Answer: If you are only using 2 pounds of chicken, then halve the ingredients and cook for 15 minutes at high pressure and quick pressure release.
I have been asked many times if 20 minutes is too much for 4 pounds of chicken. ... 
If using a slow cooker, cook on low for 4-6 hours or until the chicken is done.