The free usage tier provides 750 hours of a t1.micro virtual server instance a month. This is enough to run a virtual server instance continuously. So if you only need one instance running at a time, you can leave your instance running and remain on the free usage tier. When you are ready to terminate your server, however, you can do so using the following procedure.

To terminate a virtual server

• In the Amazon EC2 console, select your virtual server.
• Click Actions and select Terminate.
• In the Terminate Instances dialog, click Yes,Terminate.