You aren't going to brute force a random 6 character password, there are simply too many combinations.
I have myself successfully brute-forced thousands of six character and longer passwords, using John the Ripper on a multicore PC. One 6 character password typically takes under a minute. I'd be surprised if a completely random 6 character password with all four character types would take an hour. Feel free to post the Unix or Windows hash of a 6 character random password, and I'll be glad to take a (forgive me) crack at it.
Six character passwords are too short.
It's worth stating again that I only crack passwords with written authorization from my customers.