Clearing out some old images on a machine, and I came across this capture about password length / strength. Guess I read the piece sometime ago, and kept the image. Click image to enlarge.
Using 7 characters, its 2.3 hours against 2.1 years. Its interesting to note the enormous difference between all lowercase and mixed case/number characters. Look at the numbers, the difference is staggering.
Better go check your password now, before someone else checks it for you.