Open Question: Is it legal to not pay overtime if working two different locations?

So I work for a restaurant at two separate locations(still same company). I am paid with two separate checks. I work double shifts going from one to the other at least 5 times a month always working more than 8 hours of course split between the two locations. I am never paid overtime because it is listed like I work for two separate places is this legal? they have always said take a 2 hour break between double shifts and I'm not sure the significance of that "rule" anyone know? this is in California BTW