When i was an opium addict, ~300 pods might last me a few months, if i used with some restraint. By "a few", i mean 3 or 4 - from memory. It was a while ago, and glad to have that behind me.
If you take all the variables into account - likely success of germination, yield per plant, weather, mould/spoilage, tolerance, habituation, potency of strains vs their suitability for the region/soil type you are working with...you get some idea of why so few folk can self-medicate this way.
It was an interesting hobby, but I wouldn't advise going down this path without a solid back-up plan, especially if it is a pain management issue you are hoping to deal with.