Very long shifts, expect to work not less than 10hr shift, they will give you a break or lunch whenever they decide to. Be ready to lift heavy boxes, move equipment and do some other things. You have to be physically very strong person to perform this type of work. Until you become permanent, which takes not less than 2-3 or even more yrs, you have to work every holiday and every weekend, no exceptions. Shifts could start as early as 4am. I personally think that they should hire just guys to do this kind of job, no women or girls suppose to lift heavy boxes.
Takes long time to become career permanent employee, you have to wait for someone to retire.