Closing order beats door order
The natural instinct is to work through a building floor by floor, which is efficient in a single-tenant premises and counterproductive in a multi-suite one. If suite three finishes at four and suite one at seven, starting at suite one means waiting, and starting at the top of the building means arriving at the earliest-available suite last. Neither is a good use of the attendance.
Ordering by closing time solves this without any additional cost. The cleaner moves through the building in the order that spaces become available, which keeps the attendance continuously productive. It also means the suite that finishes latest is the one visited last, which is the outcome its own hours dictate rather than an arbitrary consequence of the route.
