I never really understood the "pizza" metric. Why not just state the range instead?. Two pizzas can "feed" a lot of people (perhaps 16 - 20 even) if they aren't very hungry, aren't very big or aren't very young.
I joked that I was a half pizza team on my own. The commute had me riding 25 miles per day on bike, I don't eat breakfast and only a light dinner -> lunch was easily 4 slices of pizza.
In seriousness, pizza is not a bad measure since it means basically 3 to 4 people per pizza. Thus two pizzas is 6 to 8. 2 slices is usually assumed to be the serving size. 20 people is not even one slice per person
I tried hiring a 2 pizza team once. It was very quick, as all hiring was wrapped up in about 45 minutes. It was also very inexpensive. But, they just sat there, doing nothing. I'm done with 2 pizza teams.
