I am going to go out on a limb and say this number is variable based on a lot of factors. It really comes down to what your sales/marketing strategy is, and business plan.
Some variables I can think of off the top of my head.
Sales force. If you have people out pounding the pavement every day you are going to move through product faster. If you let it happen more organically (direct sales, people coming to you) they will be greatly reduced.
Location. If you are in/right outside a major city center or tourist attraction you will get a lot more foot traffic and support from the "drink local" crowd.
Production capacity. If you are doing this part time, or are using a small apparatus you will be producing a lot less, or you will be spending much more time in producing what you do -- taking away from the time that you have to sell.
Product line up. If you are selling one product you will not have as much as if you sell 2, 3, 4 etc.
With that said, we sold between 500 and 1000 cases. (Sorry I can't be more exact, we switched billing systems half way through the year.)