If you are talking about the top 8 allergens, I would give it 2 weeks. However, if your LO seems to tolerate other veges, I would think 3-5 days would be sufficient. With allergies, it is like filling up a bucket. If you have withheld allergens from your LO and then start introducing them, either everything will be fine (WE HOPE!), or they will collect in the bucket and eventually, the bucket will overflow. Some people have a small bucket and some have a larger one. 2 weeks would be the top amount to trial the top 8. Good luck with those mixed veges!!