If you leave the Mobile site idle on your smartphone for more than one hour, then you will time-out of the application. As long as data is being added into the application, the session will be kept active. However leaving the application idle for longer than 60 minutes, will cause the application to time out. Your data may be lost if the application times out.
In the event of the application timing out - you will be redirected to the login page for your security. Any data left on the unsaved page will not be commited to the database.
Time-outs are for security reasons so someone else cannot access and enter your data if you leave your Smartphone idle.