At the top of the home page you may have seen Your Session expires in 180 Minutes. This is the time you have left before website will log you out automatically. This will only log you out if no activity has been made on the account within that time. If you are active on the account this time will refresh to 180 minutes each time you click or type on the MEDe-care webpage.
However it is best practice to log off the system when leaving the computer unattended.