So far all campaigns have started on late friday and ended on the week after late sunday, a little more then 9 days. So i'm guessing the plan is to have 9 days campaign then a work week (5day) 'rest' before starting a 9 day campaign again and so on.
Atleast campaign req stacks beyond the cap if you are at/over it. Unless they fixed that after last campaign, it's something to use for future req dumps atleast.