Typical dye immersion duration for garment dyeing is 2 hours minimum and no maximum. You want penetration of the fibers. You can only really control the color by the saturation or dilution of the dye bath. That's the trick. I'd say err on less dye, since you can always re-dye again. Hmm.. LA Guy had mentioned to dye for just a few minutes. I guess his mix is super saturated. I'll go pick up supplies this week and give this a shot on the weekend.