If your anodization method provided an acceptable pore structure, there would be no need to change your dyeing time.
If you find yourself in a situation where you actually need to use a chemical sealant to prevent excessive dye leeching, your anodize pores are too large or the coating is too thin, or both.
Chemical sealing is supposed to provide a faster alternative to the old fashioned way of sealing; by heat. It was not intended to be a crutch to get by with a poor pore structure or inadaquate coating thickness.
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