We got 9 months credit when we opened a store 2 years ago, but we have had an account with our distributor for a while and we have more than one store. Go with who will give you the best deal. Other than that all of the big ones are mostly the same.
Its depend on the how to gain trust from the people. more than 3 months can get credit for newly opend pharmacies and atleast 1 year can get credit for pharmacies that survive from last 1 to 2 years.
you should check amerisource bergen....they are a sick wholesaler...they pull through during hurricanes and state of emergencies like during hurricane isaac