If you exit the app by pressing the home button or if your screen times out, then by default the app will remain logged in for 1 minute, if you have not returned to the app within 1 minute then it will logout automatically and you’ll need to log back into the app when you open it again, this can be changed in App log-out time setting. The app also has its own timeout which kicks in after three minutes if you remain on the app but are not doing anything in it.