Every other weekend is free, between the two weekends, you have one free workday each week. Shifts are divided into blocks of morning/evening shifts. There is always at least one day off between the block of morning and evening shifts. Morning shifts usually start around 4-6 am, evening shifts usually end between 9 pm to 1 am. Shifts are about 8 hours in average, but can be as short as 6 hours and as long as 12 hours, but both these extremes are not very common. An average shift lasts between 7-10 hours.
The lines you drive on depend on your domestic depot. Each driver is assigned to one of the seven depots, each depot has about 5-8 lines assigned to it. The shift planner usually tries to give you a different line every day.