Dispel the Myths: The True Function of Cholesterol in the Body. FAITH MONEY and the Coming Collapse: New mini-documentary from the Health Ranger eviscerates govt. economic LIES...
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.
Though some people prefer to wait as long as two to three months between reapplying hair dye, a period of six to eight weeks is sufficient enough to reapply hair dye. Permanent colouring dyes contain a greater quantity of Ammonia and Peroxide where as temporary hair dyes contain either none or negligible quantities.