To run like clockwork

A wedding planner may work around the clock to make sure that a bride and groom’s wedding day runs like clockwork which means it goes smoothly without a hitch. This is important as you can’t turn back the clock and get married all over again!

Examples:

“Leading up to her exams, she studied around the clock and only stopped to eat and sleep.”

“The Japanese highspeed trains run like clockwork. They’re always on time and never cancelled.”

“If I could turn back the clock, I would have gone travelling before starting university.”