The mehndi / henna designs can last from one week to one month long. Following are some of the factors, which determines the length of time it will last:

                * How often you wash the area of the design?
                * Your skin type.
                * What part of your body the mehndi / henna is applied to?
                * Quality of mehndi / henna powder.
                * How long the paste is left on?
                * What kind of soap you use?