Say my video is only 30 seconds long, how big is the video file going to be and how much will it cost to host and play from my Amazon s3 account?

I am going to make a quick video but I want to know how much it is going to cost to host it on my Amazon s3 account. If I know how long the video is, can you tell me how much it will cost? I want to ... (to read the remainder of this article, please log in below.)