I know Rome wasn't built in a day,

from Pro Era (Ft. Capital STEEZ, Dessy Hinds & Nyck Caution) – Vinyls Lyrics on Rap Genius

Meaning

Rome was actually a republic for about 500 years before it became an empire, so yeah, the empire was far from built over night
[It was built in around 18261 nights]

Kanye disagrees though

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