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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.
Posted February 11, 2009. *JUST SO YOU KNOW* the color I use at school isn't box color like yours so I don't know for sure. but whenever I apply color to a clients hair I leave the color on for a max of 45 minutes. color stops processing at 45 minutes anyway. you could leave color on your hair for like.. 6 hours but it will just stop processing after 45 minutes. bleach is another thing though. bleach will just keep processing until you douse it in water.