Yeah, my guys have a weird 12/12 schedule too...and occasionally it bleeds over into something like 16/14...but they seem to do okay with it. :) They're pretty adaptable, and the plants don't care. :)
I'm a PRN (on call) at two hospitals, so sometimes I work nights...sometimes I work days...sometimes I go in at 5am, other times I'm in at 11am...sometimes I work ten days straight, other times I'm off for a month...it makes for a weird life for all of us, but so far no-one seems to get too bent out of shape about it. :)
Good luck to you!