Excerpts from Books and Wikipedia
The amphitheater took 10 years to build, and was used until the fifth century. It seated 50,000 people. The inaugural games lasted 100 days. [Furtado: 1001 Days] "It was used for gladiatorial contests and public spectacles including animal hunts, executions, re-enactments of famous battles, and dramas based on Roman mythology, and briefly mock sea battles." [Wikipedia]