Arrange the duck breasts in a large baking dish, skin side up. In a bowl, whisk 2 tablespoons each of the olive oil and vinegar with the honey, scallion, oregano, sage, 2 minced garlic cloves, 1 teaspoon of the thyme, 1 teaspoon of salt, 1/2 teaspoon of pepper and 1/4 teaspoon of allspice. Pour the marinade over the duck breasts and turn to coat. Cover and refrigerate for 4 hours, turning after 2 hours. Let stand at room temperature for 30 minutes before cooking.