Justin, I was using a page at TechNet for the powercfg command line options:
However, this page didn't mention that a value of 0 means disabled. Neither of these pages tells the whole story. As you say, the command line option that LH specifies takes minutes, but note the output from the -query option that I posted above where it says: "Possible Settings units: Seconds". I don't see how you specify seconds, but apparently it's "possible". Finally, the use of powercfg as described in the article for Windows Server 2003 is substantially different than the way it is used in Vista. I can see this in the parameters listed in the TechNet article on powercfg for Vista and from the command line options using "powercfg -?". For example, the Vista version of powercfg seems to require a GUID instead of a user-friendly name for power schemes in most commands, such as -query. In summary, a very confusing command with poor documentation.