Jail, one smaller PD (20 officers) and 2/3 of another PD (they have one watch of 8 hour days) do the "team" concept here with 12 hour watches. I like the concept, but obviously the strength of it, particularly with 12s, is in the strength of your team. I don't know exactly what they do for vacation and stuff, but it seems to be well regarded.
"Logic is rarely the engine that propels a police department forward."
-David Simon in "Homicide"