Hi Goncaloperdigao,
you could stop when you want.
Octane's licensing system uses a floating license scheme, which means that it is the server the one that accounts for the usage of licenses and dispatches available ones to your computer.
For you to obtain a license you need to go online at least at the time of getting your license from the server for the first time (which happens when you sign in).
When you sign out of your plug-in, both your Standalone and Plug-in licenses will be deactivated. (A Standalone license is always bound to a plug-in license, when a plug-in is launched).
Please view here for more detailed information about this:
https://docs.otoy.com/StandaloneH_STA/StandaloneManual.htm#StandaloneSTA/AuthenticationAndInternetAccess.htmRegards
Paride