How long do you have to keep henna on before peeling it off?

Henna should typically be left on the skin for at least 4 to 6 hours for optimal color development, although leaving it on overnight can yield even darker results. After applying, it's essential to keep the henna moist for the best outcome, often by wrapping it in tissue or plastic. Once you peel it off, the stain will continue to deepen for the next 24 to 48 hours.