Well i starts to get dark around 4 here in the northeast right now, 5 its full out dark.
With 220 stops I'm usually done around 4:30to 4:45 then I drop my helper off and take my hour lunch. If I have to work when it gets dark it only for a couple of stops.
Where I'm located the earliest then sunsets happens is between Dec 6 and 13 which is 4:18 pm after that it start to set later. So it looking brighter in the pm from now till Jul 3 when the sunsets at 8:30 pm.