Ans:
You'll have to write down your business plan first of all. When it comes to figuring out the period of implementing a proper milk shop business plan, you'll have to estimate how long you will consume milk.
Arranging a good place
Arranging enough funding
Buying cattle
Completing all sorts of legal documentation
Hiring primary staff for milking, cleaning, feeding, etc.
Sell milk to either locals, milkmen, or any company.
If you do everything strategically, the whole setup may not even take one month.