If I work at a promo spot, then, most likely, I will have to blow bubbles for quite a long time. I do bubbles for 5-10 minutes, then I invite passers-by, adults or children, we blow bubbles together, have fun, draw attention. After that the traffic has passed, we again put some fences around and I work again. In principle, it can go on all day long, it's quite normal. To realize your commercial interests, in this case, you can put a number of soap bubbles for sale. I think that the spot will pay off on that the day.