I think he's possibly worried there might not be any departures after 22h, but it's not very clear to me either. There will certainly be less departures at that time but I very much doubt they stop running before 23h or so. 22 is still daylight hours.
So sorry - I wasn’t clear at all.
I wasn’t talking about light from the sun. I meant light from bridges and lit buildings etc. NY and Paris are artificially lighted well past sundown and have glorious views after dark. Other towns get sleepy and a night tour would feature a few street lamps, especially on a moonless night.
Is that better?