Big Clock Card OR Timer when available

Configuration
1

Hi there,

I am looking for an option to integrate a card to my HA overview.
It should show the time (maybe with date / or current weather).
There are some proposals available in HA or HACS.
But I want to switch this card to show the time since when an entity is on (it is a plug, which I can turn on and will turn off automatically after 15 min).
Is this possible?
Or is this not possible with the current cards?

Regards

2

You could use this to do a countdown.
In an automation, when switch goes on, start timer counting down 15 min.
Not exactly, what you asked, but at least a close attempt… :wink:

https://epa64hk5svq15ze88mxkww6ox8vgqbmp.ui.nabu.casa/hacs/repository/423082071