How long can a shift be, and can I run the plant 24/7?

The Labor Code sets the day shift at a maximum of 8 hours a day and 48 a week; the night shift at 6 hours and 36 a week; the mixed shift at 7 hours and 42 a week; overtime carries a 50% premium. The implication for plant design, is that a 24/7 operation requires four crews or a structural overtime bill. Source: Labor Code, Decree 1441, articles 116 (day shift 'no more than eight hours a day, nor more than forty-eight hours a week in total'; night shift 'six hours a day … thirty-six hours a week'), 117 (mixed shift 'seven hours a day … forty-two hours a week') and 121 (overtime 'paid at least fifty percent above the minimum wages or the higher wages agreed by the parties'), text published by the MCD.