Start vacuum robot if it was more then 4 days ago

Configuration
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Hi there!

I’m not new to home assistant but I am new to the automation world of HA.
Normally I always program things in Node-Red, now I would like to start making automations in HA itself.

What I would like to do is let the robot vacuum run when it has been 4 days or longer after the last run.
Whats the best way to make this? Can this be done in one automation or does it need helpers to save the last time it has cleaned?

What I was thinking now I make a automation to save the last time it has cleaned into a helper (thing i’m running into there is how to save the date and time).
And as second trigger when it is longer then 4 days ago.

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Personally I use GitHub - enkama/hass-variables: Home Assistant variables component to create a run-time variable for my vacuum. An automation sets the variable every time the vacuum runs and then another automation triggers the vacuum to run once my wife/self leave the house w/ a condition of now()-vacuum variable > x days.

You can do it w/ last changed - but this doesn’t survive restarts - so either a variable (or input_datetime) in necessary to ‘save’ the time last run.

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Thanks for sharing!

How do i make the check if it was 4 days ago since last clean?