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Best Answer: The directions say to leave the color in for  30 minutes if you want it to last for six months. That refers to the color, NOT the bleach! I myself left the color in for an hour, but the life of the color really just depends your shampooing habits. Also, for Pete's sake, don't let any of the dye get on anything but your hair, as Splat tends to stain unforgivably.
How to Re-dye. Whether your hair was colored by a professional or at home, speak with a salon colorist to assess the damage before dyeing again. Single-process coloring is typically done once a month, and highlights are applied every two to three months.bout the Hair and Coloring. Hair dye lifts the outer scales of the hair follicle to alter the soft inner core. Re-dyeing too quickly can cause the scales to flare up, creating a dry, frizzy appearance.