Change lenght of logout window

Hi Team,

Could you please tell me how can i change the lenght of logged in status?

We have a video site, we have premium contets, so this means that users needs to be logged in to be able to watch the videos.

But the problem is that most of our video is longer then an hour so the user will be logged out and if that happen he is not allowed to watch the vide till he login again.

So because of this we need to change the login lenght for at least two hours.

Could you please tell me how to do this?

Thank you for your explanation

Thank you so much Melinda!