Review (5/5): In house brow tint
First time I follow the instructions and left the product for 3-5 minutes but i felt that it didn't tint that much so I had to re-apply the product.
The second time that I used the product I applied it for 15 minutes and the results were excellent.
If you don't have sensitive skin I would suggest to leave it for 15 min, but for a more natural look take the product from the beginning of the brow after 3 minutes so it wont tint that hard.
The tint stayed for around 5 days.