I think it depends on how many men and women you 13 people have, how big your appetite is, and whether you want to have a binge dinner or a more economical and low-calorie dish.

If there are more men and the overall appetite is large, I think 13 to 15 hot dishes and 4 to 6 cold dishes are more suitable, and you can have another soup.

If there are more women, the overall appetite is not very good. 3~6 cold dishes should be enough.

Of course, if you have a rough meal, you can order 15~17 hot dishes and 4~6 cold dishes. If you want to eat almost all of them and eat a lot, 11~13 hot dishes and 3~5 cold dishes should be a more economical choice.

What's more, I think the most important thing is not the specific number of dishes, but the order.