In case of an emergency, the school has a calling list so that everyone is called

In case of an
emergency, the school has a calling list so
that everyone is called in the least amount
of time. Each of the first 3 people on
the list calls another 3 people on the list.
Then, each of the people in the second
group calls another 3 people on the list,
and so on. The fifth group of people will
make 243 calls. Is this statement accurate?