My DC dept seems a lot more scattershot and less regimented than this. Altho I guess there could be more going on behind the scenes.
Usually its just once the plan is done, go home. No choice. Some flexibility in that (sometimes they may poll who wants to stay, send the ones who want to leave earlier) but it changes every day it seems. Anything that involves extra work, math, or thinking ahead by management is unlikely.
They also seem to not like to do VNS at SOS, because they are always terrified of not making plan. They would rather have 30 extra ppl and force everybody at 2, than finish 1 ssp short of plan, BY FAR. All so that the night shift can go home at 9 most of the time...like lord forbid night crew they have to stay a little bit cus we didnt make plan...not to say they we do SOS VNS.
We also have weird things like random TM's signing up for and getting OT during the week, all while we RARELY get a full 36 hrs. Basically it's just a mess. What else is new.
Also we have a few "favorites" that of course always get to stay (albeit they may be in positions someone could deem more necessary, like label printing or water spider). This seems borderline illegal to me, using favoritism to determine hours and peoples livelihood is a new low, but noone seems to care anymore.