Final answer:
Cornrows should be removed, shampooed, and conditioned within 1-2 weeks to ensure healthy hair.
Step-by-step explanation:
To ensure healthy hair, cornrows should be removed, shampooed, and conditioned within 1-2 weeks. Leaving cornrows in for longer periods can lead to build-up of oil, dirt, and product residue, which can harm the scalp and hair. It is important to shampoo and condition the hair properly to maintain its health and cleanliness.