The best answer to this question is presented within statistical data compiled and presented by the National Institute of Standards and Technology. The following link provides some interesting insight into the likelihood of compromising the 128-bit Rijndael encryption key. (Remember, we use the 256-bit key, even more secure than the 128-bit key referenced in the article) Please refer to question number 16 once the link opens.
http://www.nist.gov/public_affairs/releases/
aesq&a.htm
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