Rome wasn't built in a day UK /ˈɹəʊm ˌwɒzənt ˈbɪlt‿ɪn‿ə ˈdeɪ/US /ˈɹoʊm ˌwʌzənt ˈbɪlt‿ɪn‿ə ˈdeɪ/ saying1 •It takes a long time to create something complicated or impressive.I know this project is a big undertaking, but you need to have patience and be hopeful. Remember that Rome wasn’t built in a day.