The Whole 30 program continues to be popular because 30 days totally clean seems the agreed upon minimum. Whole 30 offers a few different reintroduction plans on their website and in the books. https://whole30.com/step-two-finished/ They test dairy as the entire group.
Chris Kresser suggests a more methodical reintroduction for dairy. It was something along the lines of 3 days each of butter, then cream, then cheese, etc. https://chriskresser.com/5-steps-to...paleo-protocol/. This more methodical reintroduction seems better to me because what if cheese didn’t agree with you due to histamines not the milk.