There is a device Type = duration which does provide the duration of something to HA.
This can be either mins, hours, days, months… and so on.
Unfortunately, it depends on the card how this duration information will be shown:
AS you can see in the screenshot, the entities list is only showing the duration in hours, while the entity card is either showing hours or days or any other value.
I would like to see an option with which you can define in what unit the value should be converted to, and how it should be displayed… (for example, only show hours → just like in the entity card, or converting the value into days)…
This option should be available for the entities list, and especially for the new tile card - maybe as an additional feature?
for the entities list, it might be ok to only use this as an yaml option, without corresponding option in the UI… ?