The longevity of a temporary hair color depends on several factors, including: Product type: Different temporary hair color products have different formulas and ingredients, which can affect their longevity. Some temporary hair colors may last for just a day or two, while others can last for a week or more. Hair type: The texture, porosity, and thickness of your hair can affect how long a temporary hair color lasts. Coarse, thick hair may hold the color for longer than fine, thin hair. Care and maintenance: The way you care for and maintain your hair can also affect the longevity of a temporary hair color. For example, washing your hair too frequently or using hot tools can cause the color to fade faster. Most temporary hair colors will last between one and two weeks, although this can vary depending on the specific product and individual factors. To extend the longevity of a temporary hair color, it is important to follow the manufacturer's instructions for care and maintenance and to avoid activities that can cause the color to fade faster.