Minimum 2 means at least 2 or that 2 would be ok but 3 perfect and 1 not good at all..Ok you worked in many different areas and brands that is very good and important because now you have experience ... in the past I had many clubs and I worked in the event management business..Back then I lost some money too and had bad luck..It's important to learn from failures.A nail salon sounds very interesting.In Germany many people go to nail salons and it is very popular.the market is growing here because for example in the USA you have millions of nail salons and it's not special anymore you have many high end nail salons. But in Germany the market is still open you still have potential. I mean who knows. I always think international.