Surely you sometimes think you´ve wasted too much time on a website, or you´ve lost track of time completely as a result. To avoid this you need a program like Rescue Time.
Rescue Time works to collect data about the time you spend connected to a certain website, server or host. For this it uses a small icon situated in the system tray, and the data is automatically sent to your Rescue Time account. There you can consult statistics in all their detail.
Rescue Time is a completely free tool and doesn´t take up much space on your hard drive: just half a megabyte. You need to register (also free) on the author´s website for it to work correctly.