Couples work same shift if you want (I remember one couple with pets worked opposing shifts). Productivity targets are doable. Last year workampers were asked to reach 85% of usual targets. Also, there's a 'ramp-up' period for the first few weeks, to get your body and mind used to the pace.
It works like this: if the "target" is 100, your target will be 85. But week one it'll be 50 (or something like that), week 2 will be 65, week 3, 75.
Then, if you don't hit the target "consistently" they'll probably give you some remedial or 1 to 1 training to help you get on track. Then if after couple weeks you're still below par, maybe some more training or a move to another department. A few weeks more, maybe a "first warning" letter. Then they monitor your performance a couple of weeks, and suddenly "Hey, it's Christmas, goodbye."
More important than speed is accuracy. And timekeeping. If you make too many mistakes, or show up late (including after breaks) or if too many minutes pass between actions (the computer never sleeps), you will be talked to.
