As you know every fill can be different. The shedding cycle is very unpredictable which in turn makes scheduling a fill more difficult as I do not know if you need a small, medium or large fill. Please feel free to send a picture of your eyes for me to determine , see the other side for examples of what each type of fill will look like approximately.
If you have under 40% of your lashes left, it will be considered a full set on your next appointment as it will take the same amount of time to complete the set. To avoid this I recommend booking your appointments every 2-3 weeks, depending on your lashes ( if you need help determining the size refill that you need, I will be happy to give you my honest opinion).