The ancient Greek Olympics were held once every 4 yr ... the same as the modern Olympics.
Once, in the 2008 Olympics
The Olympics are held once every four years.
Once, the 1996 Summer Olympics.
Only once, in the 1968 Summer Olympics.
The Olympics are held once every fourth year.
Bejing has held the summer Olympics once.
Once. Moscow hosted the 1980 Summer Olympics.
4 years 4 yearsThe Summer Olympics are held once every 4 years.