Rome wasn't built in a day
Valuable projects take time.
ELEMENTARY SCHOOL PUNCTUATION QUIZ
Idioms and Phrases with rome wasn't built in a day
Important work takes time. This expression functions as an injunction or plea for someone to be patient. For example, You can't expect her to finish this project in the time allotted; Rome wasn't built in a day. This phrase was a French proverb in the late 1100s but was not recorded in English until 1545.