It is known that the construction of the Colosseum in Rome took at least eight years. But the Romans could have completed everything much faster if they wanted. For example, the first Julius Caesar bridge over the Rhine River in Germany was built in just 10 days. And this is thanks to 40,000 legionnaires. It is very doubtful that such a bridge could be built in one day.
As for the city, it is naturally much more difficult than building a bridge. Additionally, many Roman houses had six floors, and the upper floor could not be built until the lower floor was completed.
Additionally, cement takes more than a day to harden, and because Roman streets were extremely narrow, it was impossible to deliver all materials for each building at the same time. Therefore, it is clear that the construction of Rome took several years.
Source: Ferra
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