Sizing the zones so they can be isolated briefly
The zone has to be small enough that taking it out of use for fifteen or twenty minutes is tolerable. Half a corridor, one bank of amenities, a section of seating, one entrance of several. If the zone is large enough that isolating it forces people to change route significantly, the rotation will be resisted and eventually abandoned in favour of working around occupants, which achieves very little.
Each zone needs a defined intervention rather than a general clean. Knowing that a particular amenity block takes eighteen minutes for a full service allows the rotation to be planned against real time. Where a zone genuinely cannot be isolated at all, it should be identified as such and given a different treatment, usually a light presentation pass with the detailed work moved to whatever window does exist.
