Planning a summer of sun, sea and style? If you're thinking of getting hair extensions for a special event and hoping they'll last you through holidays and beyond, here's what you need to know. How Long Do Hair Extensions Last? With proper application and care, high-quality 100% natural human hair extensions can last up to 3-4 months. The key? Choosing a professional extensionist who uses trusted products - and following the right aftercare routine. Holiday Hair Extension Car