it says you can use 1 mL twice a day on your scalp, i only have a small area to work on now, it only takes like 1/5 mL to get my area wet. so if i want to use 1 mL, i would need to apply once then wait it to dry, then apply it again, and repeat till i have used 1 mL. I am not sure if 1/5 mL...