Meaning Major and important projects take time.
Usage Worldwide, but less commonly than in the past.
Example
- The new airport won't be finished for another ten years. I know Rome wasn't built in a day but that seems too long to wait.
Pronunciation
Idiom
Rome was not built in one day
What does "Rome was not built in one day" mean?
Major and important projects take time.
Rome was not built in one day
Britain, 16th century. From a translation of Erasmus’s proverbs.