How many years did the Roman state exist?

The Roman state existed for a long time.
To calculate how many years the Roman state existed, you need to know its foundation date and the time when it collapsed. Later, since the countdown went backwards, and all this happened before our era, we need to add everything up:
Founding of Rome – 753 BC
Fall of the Western Roman Empire – 476 BC
753 + 476 = 1229 years – there was a Roman state.
Answer: The Roman state existed for 1229 years.