Why do people say 4 weeks is a month when it's really 28 days?

People often refer to four weeks as a month for simplicity, as four weeks total 28 days, which aligns with the shortest month in the Gregorian calendar. While most months have either 30 or 31 days, using four weeks provides a quick and easy way to estimate time without dealing with varying month lengths. Additionally, in many contexts, such as budgeting or scheduling, four weeks is a practical approximation for a month.