But there are only so many delivery people. 1,000 delivery people simply cannot give 2,000 people their groceries within a 1 hour window. The timeslots manage w

But there are only so many delivery people. 1,000 delivery people simply cannot give 2,000 people their groceries within a 1 hour window. The timeslots manage when the deliveries occur. People also sleep at different times, and some essential employees are still working, so you can't simply deliver the groceries to everyone without a known time.