I think you are overthinking this question. If the cream is to be applied every 72 hours for 30 days, then the doctor or prescriber has given you your stated days supply.
You will tell the insurance and put in your days supply field in the computer 30 days supply for this prescription so you can process it.
It is honestly that simple.
Thank you for your question, and try not to overthink these days supply questions. This question is deceptively simple.
Patient is prescribed 10g of Glucose. The glucose is presented as a 5% solution in 500ml Saline. How much of the 5% dextrose saline solution do you need