Miss Manners: How long is too long to linger at a restaurant?

Dear Miss Manners: After 2 hours astatine a edifice with a radical of friends, everyone had eaten, the cheque had been settled, yet nary 1 left. We stayed astatine the array for different 30 minutes, chatting away.

The edifice was not engaged and nary 1 was waiting for a table. But I can’t assistance but deliberation that we lingered acold excessively long.