You can activate the Auto Logout Feature within your CoinTracking Account in the Security Settings of your account settings. You can choose between several options.
If you choose for example 3 hours and those are over, reloading your CoinTracking page or a opening a new CoinTracking page will require a new login. There is no counter is running down and if it hits Zero, you get automatically logged off. Instead when you navigate to a new page there is a check how much time is left. If the counter is <0 then your session is invalid and your have to log in again.
To activate this feature or change it, you have to log off and login again after saving the settings.