It will last a lifetime.
The following client bought a closure from Miss MyMy in 2009...Yes I said 2009. She had it colored to her natural hair color which is a very very light ash blond.
The closure she purchased was made from Malaysian Straight hair which has a very dark natural color.
This client winters in Florida so her hair is exposed to a great deal of sunshine...damn that sunshine state...lol
Below we see the before pictures, originally taken in 2009.
She came in a week ago asking us if we could tone her hair as it was getting a bit gold...after 2 years...wow....no hair loss at all and she has worn this hair every day, all day for 2 years. It is now her hair.
When asked what she did to make it last so long without any hair loss. she said she washes often with Miss shampoo and conditioner, uses Miss MyMy serum and makes sure to treat it every 2 weeks. If your hair care regime does not look like that ,you're not doing it right.
This is a picture of the closure taken prior to coloring Sept 2011
The pictures speak for themselves.