* Type of highlights:
* Temporary highlights: These wash out after one shampoo. Examples include hair chalk, colored hairspray, and some hair mascaras.
* Semi-permanent highlights: These gradually fade over 6-8 washes. They don't penetrate the hair shaft deeply.
* Demi-permanent highlights: These last longer than semi-permanent, typically around 24-28 washes. They contain a low-volume developer that helps deposit color.
* Permanent highlights: These are the most long-lasting, as they chemically alter the hair. However, they don't truly "go away." The color will fade somewhat over time, but the highlighted portion of the hair will remain lighter until it grows out or is recolored.
* Hair growth: As your hair grows, the highlights will move further down the hair shaft, and your natural hair color will grow in at the roots. This is often the most noticeable factor in how long highlights "last."
* Hair care routine:
* Washing frequency: Washing your hair less often will help preserve the color.
* Type of shampoo and conditioner: Use color-safe products formulated for color-treated hair. Avoid harsh sulfates, which can strip color.
* Heat styling: Excessive heat styling (blow dryers, curling irons, straighteners) can fade color faster. Use heat protectant products.
* Sun exposure: UV rays can also fade hair color. Use hair products with UV protection or wear a hat in the sun.
* Initial color intensity: The brighter or more vibrant the highlights, the more noticeable the fade will be.
* Hair porosity: Porous hair (hair with more open cuticles) tends to lose color more quickly than less porous hair.
General timeline:
* Temporary: 1 wash
* Semi-Permanent: 6-8 washes
* Demi-Permanent: 24-28 washes
* Permanent: Grow out completely, though the color will fade over time. Expect to need a touch-up every 6-8 weeks, depending on how fast your hair grows and how different the highlights are from your natural hair color.
If you're concerned about your highlights fading:
* Talk to your stylist about the best type of highlights for your hair type and lifestyle.
* Ask for recommendations on color-safe hair products.
* Follow a hair care routine that protects your color.
In summary: "How soon" depends entirely on the factors above. Temporary highlights are gone immediately, while permanent highlights require grow-out or touch-ups. Demi-permanent and semi-permanent highlights last a relatively shorter amount of time.