Have you actually thought about this, or is this just an off-the-cuff remark without any consideration?
Because right now NA resets at 11am Eastern Time, which is 5pm Central European Time. And so you seem to argue that 5pm-1am (which is 8 hours of raiding) is "not prime time", while 11am-7pm is. And you also seem to assume that the entire target audience is located in exactly the same time zone as the event they're watching.