Overnight is not neutral for a display space
An evening clean leaves a showroom in excellent condition at nine at night and something slightly less than that at nine the following morning. Dust settles on horizontal display surfaces, glass shows marks under morning light that were not visible under evening lighting, and anything that moved overnight is still where it ended up. In a display space those details are the whole point.
That is why a morning completion generally produces a materially better result than an evening one for this particular kind of premises. The same work performed a few hours later in the cycle lands immediately before the moment it is being judged by a customer, rather than a full night beforehand with everything that settles and shifts in the intervening hours.
