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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.
Rating Newest Oldest. Best Answer: It all depends on the make of the dye because each brand varies in the time needed for the dye to develop, but only slightly. The actual dying i.e. putting the dye on your hair can take anywhere from 20-60 minutes depending on the length of your hair and how thoroughly you apply it.ead the back of labels as it varies, and depends what colour. usually it takes half an hr to apply (giving on hair length) and half an hr or less for it to stay in, then you have to shower and wash it out... then blow dry it. so i suggest give it an hr and half maybe 2 hrs. usually 2 hours plus at hairdressers.