The lifespan of your clip-in extensions for curly hair depends on the care that you provide, how often you wear them and how often you use heat styling tools on your clip-in extensions. Generally they can last anywhere between 6 months to a year or even longer. Extensions can be good for your hair. If you decide to add length and choose high-quality, carefully-applied extensions, you can save your natural hair from damage. They'll spare your endsespecially if you use a lot of heat tools or are prone to breakage or split endsfrom too much manipulation and keep them healthy.