Duration and Time limit

Duration noun - The period during which something exists, lasts, or is in progress.

Time limit and duration are semantically related in time topic. In some cases you can use "Time limit" instead a noun "Duration", when it comes to topics like period, time period.

Time limit noun - A time period within which something must be done or completed.

Duration and time limit are semantically related in time topic. Sometimes you can use "Duration" instead a noun phrase "Time limit", if it concerns topics such as period, time period.