Leave it on for at least an hour - overnight is better, actually, and a shower cap is fantastic for applying/trapping your body heat to help it set. When you rinse the dye out use cool water and a white vinegar final rinse (diluted). Wash as little as you can, and always use cool water (hot will make it bleed more), and a very gentle shampoo. Limit oiling as much as you can.
You're still going to have a lot of fade and bleeding - healthy hair tends not to be as porous and punky type dyes are really just stains - but you can get some time out of it if you're careful.
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