Check out the 'B33r&Mug' example near the bottom. Make that style up to 12 characters long, and you will only have reason to worry when quantum-computing is mainstream.
Please keep in mind that this site is from 2009. Nowadays gpu farms are used for password cracking which are a lot more efficient as a "pentium 100".
Fair point. And actually, the page wasnt able to note the amount of hashing power now available, due to a certain distributed network in 2014!
Best we stick with 30+ characters then, and/or more factors.