What is the days supply for eye drops?

What is the days supply?

Otic suspen – 10 ml and 3 gtts to left ear tid
Use: 20drops/ml
This is what I did and probably is wrong.
Since near are 20 drops in 1 ml next there are 200 drops contained by 10 ml. and the doctor said to give 3 drops to vanished ear 3 times a day so 3 drops x 3 times a day= 9
Then 200/9 contribute you 22 days. Is this right? if not please hoof it me through this step by step.
ThanksWhat is the days supply for eye drops?
You are correct.
Unless there be any other restrictive instructions, you are correct.