The window closes fast
Produce residue left overnight ferments, adheres to the floor and attracts activity. Removed within an hour or two of trading finishing, most of it lifts with mechanical action and a modest amount of water. The difference in effort between those two scenarios is substantial, and it is entirely a scheduling decision rather than a matter of method or equipment.
That argues for an attendance timed against the end of trading rather than a fixed evening slot. Where trading finishes at different times on different days, the schedule should follow it. A fixed time that suits the roster but sits three hours after the floor was last used costs more in labour and produces a worse result than a variable one. Recording the trading pattern day by day, rather than assuming a uniform week, is what allows the attendance to sit where it is most effective.
