if it is ot after 8 hours rather than ot after 40 hours minus breaks and anything else they can get away with. probably fine if your employed direct if you have a minimum amount of hours they have to pay you. However if your agency i would bet that you would do 3 13’s then all of a sudden be stood down.
Alot of the agency warehouse work i did was like that would work you up to what ever the overtime point was then send you home.