Famous How Long Does Hair Color Take To Process References. So when you've dyed the very last strands of hair, you let the dye in all of your hair. Ultimately, picking between letting a professional dye your hair or doing it yourself comes down to what you’re looking for.

This time frame includes the amount of time required to apply the dye to your. Ultimately, picking between letting a professional dye your hair or doing it yourself comes down to what you’re looking for. An at home root touch up will take about an hour.