This is why next day delivery slots worked - shops were able to pack orders during quiet periods rather than suddenly getting slammed with delivery orders that will be picked up in 20 minutes just as the lunch rush arrives. Some of the shops we were delivering for had people they employed specifically to do this, and generally they loved it because it meant their staff were doing something during otherwise quiet periods.
Next day slots generally work for few customers. We offer delivery in the next 3-4 hours (unless demand is crazy) and the difference in demand when you offer 3-4 hours and when you offer next day is HUGE.
