Touch Apps - What Happens after the expiration of default 30min session time?

Hi community,

Using Azure AD for authentication.

I have two questions.

1. What’s the behavior of the system, after expiring the session ID which has a limit of default 30 min? Will a new Session ID generated and client stay connected or should the client/user has to login again? 
2. Is there any way to extend the lifetime of 30mins session?

Appreciate any input. 

/Nimesh