Start a timer with a given number of minutes / dynamic duration

Configuration
6

You cant use templates in the core version of Lovelace.

baunan’s and obaldius’ examples work because they are calling the service with a template in the backend (an automation or script), not the frontend (Lovelace).

You have two options:

  1. Put your service call and template in a script. Call the script from Lovelace. Or
  2. use a custom Lovelace template card. This uses JavaScript templates, not jinja.
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