It really depends on the desired shade and fabric. To achieve the color on the box or bottle, we suggest 30 to 60 minutes with continuous stirring. For lighter shades, we suggest 10 to 20 minutes. For 100% polyester and polyester blends, at least 30 minutes is needed for the dye to be absorbed into the fabric, even if fabric appears to have reached the desired shade in less time. Nylon tends to dye very quickly and much darker than other fibers so the actual time needed in the dyebath is much less. Colors always appear darker when wet and will dry lighter. So keep that in mind before removing an item from the dyebath.