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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.
Leaving color dye on your hair for longer than 45 minutes will not alter the color results, but may unnecessarily damage hair. Slight Color Change. If you are altering your current color by one or two shades (either lighter or darker), you may achieve desired results by leaving Color Charm on your hair for 30 minutes.