Promises and clocks

How the Thursday promise is computed, and when it changes.

2.1The promise tile#

The promise is computed when the order is placed and recomputed after every station: computed at checkout. It only moves later when a station is late; it never moves earlier.

2.2Cut-off times#

Table 2.1 · Cut-off times for a Thursday promise

The second row is the one warehouse staff watch: an order packed by 07:10 on Tuesday still makes Wednesday's first wave (Table 2.1).