Put in at least 2-3 hours!!! And then you will have to run "at the pace of the waltz." Of course, it's more interesting with an excursion, but even without it, you can feel the atmosphere. I advise you to come to the opening in the morning, after 12:00 there are already crowds.
Complete immersion in ancient Rome. I was delighted. Take a walk through the Colosseum, then along the footpaths in the Roman Forum and climb the Palatine.
Admission is included in the ticket to the Colosseum and the Roman Forum. The territory is large. The observation deck offers a wonderful view of the excavations of the ancient city. The ticket is around 12 euros.