^ One thing we're all overlooking at this point: there wasn't really a need for a 4 shift rotation, was there? In the conflict with the Borg, the writers never even brought it up. You'd just assume that in any dire situation, people would be pulled from off-duty or slumber to jump in and help for as long as they were needed.
So why institute this shift rotation? Without a good hard case to show WHY Jellico instituted this 4 duty shift rotation, it kind of falls flat.
Because you're likely sharper looking at a display for six hours instead of eight. The longer you sit there, the more likely it is that your response time suffers.
I *still* don't know what the hell Chekov and Sulu are doing to keep from going batshit insane.
SULU: "Sitting here. Still sitting. Looking at a starfield. Running out of things to talk about. Oh look, Spock gets to look in his viewer all day and do stuff on the computer. Uhura gets to talk to people all over the ship."
SPOCK: "Mr. Chekov, I need you over here at the science station to assist me."
SULU: "What the..."
Chekov: "Neener. Neener."