To convert real time into "time mentioned" or "pastime," it seems you are referring to a fictional or imaginary concept of time. Since such concepts do not have a universally recognized conversion method, it would largely depend on the specific rules or context established within the fictional world you are referring to.
In works of fiction, authors often create their own rules and systems for measuring time or establishing alternative timelines. These rules may involve different units, scales, or even entirely different concepts of time. For example, in some science fiction stories, authors may introduce concepts like "stardates" or "galactic cycles" to denote time.
If you have a specific fictional world or concept of time in mind, it would be helpful to provide more details about it, such as the rules or context established within that world. With that information, it may be possible to discuss how to convert or relate real time to the fictional concept of time.
Keep in mind that the conversion or interpretation of time in fictional contexts is typically subjective and dependent on the author's imagination and the rules they establish for their fictional world.