Aeon and Duration

Aeon noun - A long or seemingly long period of time.

Duration and aeon are semantically related. in period of time topic. In some cases you can use "Duration" instead a noun "Aeon", when it comes to topics like extent of time.

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

Aeon and duration are semantically related. Sometimes you can use "Aeon" instead a noun "Duration".