Staggered breaks change the answer
Large distribution sites frequently run breaks in sittings so the operation continues, which means the crib room is used across a longer period than a single break would suggest. If there are two or three sittings, the useful moment is after the last one rather than after the first, and a schedule built on an assumption about a single lunch hour will consistently arrive too early.
Establishing the actual pattern takes one conversation with a supervisor. It is worth doing before the schedule is written rather than discovering it after a month of poor results, because the difference between arriving after the first sitting and after the last is the difference between cleaning a room that is about to be used and one that has finished being used.
