Examples:

• A week is a long time in politics—a candidate ahead in the polls may drop out of the race a few days later.
• Last Monday, the candidate was trailing in the polls, but now she's the frontrunner. Truly, a week is a long time in politics.
• The underdog team won two consecutive matches and moved up the standings. A week is a long time in sports.
• Stock prices plummeted on Tuesday but rebounded by Friday. A week is a long time in finance.
• A new app went viral and attracted millions of users within days. A week is a long time in the tech industry.
• The company's shares surged after a major deal was announced. A week is a long time in business.
• The students struggled with the material initially, but after intensive tutoring, they aced the test. A week is a long time in education.
• The patient showed remarkable improvement after the new treatment. A week is a long time in health.
• Last week's fashion show set a new trend that everyone is now following. A week is a long time in fashion.
• They were on the brink of breaking up, but now they’re planning a vacation together. A week is a long time in relationships.