Following our discussion , there are maximum 8 working position/line and per shift.
When 2 lines running there are 16 working positions. Usually it takes less than 2 hrs to find replacement in case of absenteeism. Therefore, we do not need SPARE.
As a conclusion, there must be 16 workers/team (subcontractors)
Please revise the number of subcontractors accordingly (from 19 to 16/team). Reduction of 6 HC is due to low production volumes and stop of the factory on Sunday.