VLK's are 30 days as well, they just attempt auto activation after 3, but in Windows 8 there appears to be no grace period, although there might be one with legitimate non-demo keys, we'll find out when people get their technet/MSDN keys.
lmao, I don't know why people are trying to discuss things like win8 grace period/re-arms when nobody has yet got a win8RTM trial key to install a win8 trial copy.