* Temporary hair color: These can last 1 shampoo until whenever you reapply it, based on your hair type and the color that you apply to your hair.
* Hair masks/deep conditioners: These products are used to deliver intense hydration, repair, or other beneficial ingredients to the hair. You should always read the label, but generally:
* Typical leave in conditioner: 5-15 minutes, depending on the intensity you're looking for.
* Very deep conditioning: 20-30 minutes, or sometimes longer if specified (e.g., overnight treatments).
* As always, follow the product's instructions. Some masks might have shorter or longer recommended times.
Important Note: Never leave a product on longer than the recommended time, especially with color products. It can cause damage or unwanted results.