How local is Homey SHS really with a subscription?

Hello!

What I currently fail to understand is,
since you can have a subscription on Homey SHS, how often does it reach out to the internet to check if my license is still active/valid?

Please note I’m describing a worst case scenario here,
But if my internet would be out of 2-5 days will it still operate normally?

And of course does the life time purchase remove this check?

Looking for forward to these answers!