[TheGame1986]

@TheGame1986 with "Authentication Key" method, there is no time limit after the login, expire only the ".key" file created,
but Netflix can cut out your login on the addon for other reasons or by your choice like "Account sign out devices" or change pw.
There is only a limit for RPI devices, every time you update the OS you have to re-login Netflix again because the OS update "reset the security key".
Of course, since everything is unofficial, there could be other unknown cases.

Thanks for the info! Much appreciated