Unless you do a test you will never know. Hee hee
So here goes.
Get you bottle and dip in your brush, I usually have one dip per hand, that normally does the trick, so 2 dips per client.
Now........ are you getting me so far.......... Hee hee
Now you have to see how many ''drops'' you get from one bottle.
Should take you a couple of hours.
Im actually laughing while typing this. I picture you counting the drops.