Use Days instead of seconds

[teaalltr]

Use ChronoUnit.Days instead of seconds

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[CLAassistant]

All committers have signed the CLA.

[gmarziou]

Thanks. Please squash your 2 commits into one.

[DanielFran]

@gmarziou we can "squash and merge" 😉

[gmarziou]

Right, I'm still not used to this new feature of github.