What's an appropriate amount of soup to have for lunch or dinner

I tap out on a large pho sometimes. But like boiled crawfish I'll be hungry again an hour later.

A bowl. A bowl of soup. If it's tomato soup it gets a grilled cheese sandwich cut in half for dipping.

I like to have enough for 4 others.

I'd say a gallon.

If you're serving nothing else at all, in general, 12-16 oz. sort of depends on the soup. I serve at least 12 oz of gumbo, but it also has rice in addition. There's usually a salad and French bread or cornbread for guests. If no guests, bread and gumbo. Also, if it's a rich cream soup, I wouldn't go over 12. Sort of depends on the soup.