We would recommend replacing bait, if needed, after 2-4 weeks. You should continue to use the products in the Roach Control Kit as long as you continue to see roach activity.
New York State has strict regulations on insecticides that can and that cannot be shipped to customers without an applicators license. The New York Roach Kits contain specific professional grade roach products that can ship to New York customers and do not require an applicators license.