There is no quiet time, only quieter times
Every continuous site has a rhythm even when it never stops. Shift changeover creates a short window where the floor is thinly occupied. Dock activity rises and falls with transport schedules. Amenities are heavily used at break times and almost empty between them. Mapping that rhythm during the walkthrough is more useful than asking when the site is quiet, because the honest answer is never and the useful answer is a set of intervals.
Once the rhythm is documented, tasks can be matched to it. Amenity cleaning belongs immediately after a break period rather than before one. Office and administration areas suit the lightest-occupancy shift. Floor work in a pick aisle needs a coordinated pause or a temporary isolation. None of that is complicated, but it will not happen unless the scope specifies it rather than leaving the timing to the cleaner's discretion.
