The term "time span" refers to a period or duration of time, usually measured between two points in time. It can be used to describe how long something lasts, such as an event, a project, or even a person's life. The length of the time span can vary greatly and is often expressed using units of measurement like days, weeks, months, years, decades, or centuries. In essence, "time span" refers to the amount of time that passes between two points in time, whether it be specific moments or more general periods.