Time between emailed invoice and credit card charge

I am seeking information on the financial arrangements associated with an account. I represent a church that wishes to backup their web sites to AWS. However, the financial people have a requirement that they must be able to view an invoice before the monthly charge for the storage service is debited from the credit card. So, my question is: How much time is given between the time an invoice is sent out and the time the credit card is changed for the monthly storage cost?