THIS, and it applies to far lower tech than modern pharma. A century ago, one of my grandfathers was a blacksmith in a little farming town, which had a little canning factory. During harvest season, when that factory was running 24-hour days, grandpa was paid to sleep there every night. Canning food is a complex, time-sensitive, and safety-critical activity. If production is halted even "briefly" - you may have to start throwing out large quantities of spoiled food, waste more time re-sanitizing things, etc.