Let's say each pizza is eight slices, and each person eats two slices. So, a team should only ever be around eight people. Personally, as a former manager, I've found the sweet spot to be 6 people for software.

It varies, but a large pizza will generally be 14", 16" or 18". All three sizes seem to be commonly used, although 18" is generally more associated with New York or New York style pizzas; 14" is generally more associated with the big national chains.

Diameter of 14" = 35.6cm = an area of 993 cm^2.

Diameter of 16" = 40.6cm = an area of 1.3k cm^2.

Diameter of 18" = 45.7cm = an area of 1.6k cm^2.

And down thread someone from Germany says large pizzas there are 26cm, which would be an area of 531 cm^2. That's less than a third the size of an 18" pizza!

I once read somewhere that a two pizza team is 5-10 people.

So, I assume the pizzas in the US are pretty large.

Our "large" pizzas here in Germany have a diameter of 26cm. I usually eat one of those on my own.