Semi-permanent dye on a human hair BOB Wig typically lasts between 4 to 6 weeks. However, the exact duration can vary based on several factors:

Factors Affecting Semi-Permanent Dye Longevity
1. Frequency of Washing: More frequent washing will cause the color to fade faster. To prolong the color, limit washing and use cool water.
2. Exposure to Sunlight and Heat: Sunlight and heat can cause the dye to fade more quickly. Avoid prolonged exposure to direct sunlight and use UV protection sprays if possible.
3. Quality of the Dye: High-quality semi-permanent dyes generally last longer and provide more vibrant colors.
4. Hair Condition: The initial condition of the BOB Wig hair can also affect how long the dye lasts. For example, virgin hair (undamaged hair) may hold color differently compared to processed hair.

Tips to Make Semi-Permanent Dye Last Longer
- Use Color-Safe Products: Opt for sulfate-free shampoos and conditioners specifically designed for color-treated hair.
- Wait Before Shampooing: After dyeing, wait at least 48 hours before washing the BOB Wig to allow the color to set.
- Protect from Heat: Use heat protectant sprays if you need to use heat styling tools.
- Store Properly: Keep the BOB Wig in a cool, dark place when not in use to maintain color vibrancy.

By following these tips, you can help ensure that your semi-permanently dyed BOB Wig stays vibrant for as long as possible.