Final answer:
The assertion that cornrows can last a few weeks to two months depending on whether they are done with or without extensions is true. Proper maintenance and individual hair characteristics can affect the longevity of this hairstyle.
Step-by-step explanation:
The statement that cornrows can last several weeks without extensions and up to two months with extensions is generally true. While individual results can vary based on hair type and maintenance, cornrows are a type of protective hairstyle that can last for a considerable amount of time. Cornrows without extensions might last a few weeks given proper care, while the use of extensions can prolong their durability, extending the time they can be worn to as much as two months. It's important to note that this timeframe can be influenced by factors such as the wearer's hair growth rate, scalp health, and how the cornrows are cared for. However, like with other long-lasting hairstyles such as a perm or 'permanent', over time new growth will alter the appearance of the cornrows, and thus maintenance will be necessary to keep the style looking fresh.