Timing against shifts rather than against the day
An amenity block on a site running two shifts is used hardest at the changeover, and its condition at the end of the first shift is what the second shift experiences. Servicing only after everyone has left means the block spends most of its working life in the condition the previous shift left it. Moving one attendance to the changeover often improves perception more than adding an attendance elsewhere.
The shift pattern also affects consumable planning. A block serving forty people across two shifts consumes at a different rate and in a different rhythm from one serving forty people in a single shift, and dispensers sized for the latter will run empty. Setting quantities against the actual pattern rather than the headcount is a small adjustment with a visible effect.
