Mobile session length
I know that Google Analytics ends a session after 30 minutes of inactivity. What I'm wondering about is how this applies to mobile traffic. If the mobile device goes to sleep or locks the screen, does this end the session? If the user has a web browser window open, then switches to a different app for 10 minutes and comes back, is this the same session (does switch the active app end the session)? Following on the last point, would it count those intervening 10 minutes of inactivity as part of the session length (thus diluting that metric, since they weren't active)?