Aveline
grandtanteJE65 these cafes are in business. They have high rents, rates, utilities and staff costs to cover. They're not charities. It's not fair on them to hog tables endlessly on one cup of coffee.
They will often bring a lot of business in to that cafe on other occasions. My son runs a pub along the river which is always full of working business men, who sit for hours drinking a cuppa, however they also have their business lunches, dinners and other business dates there when they spend a lot of money. If the cafe owner is not worried, leave it be, they are happy or they would say something about it for sure.

