Vader would go out and patrol every time dusk came.
Most of the time, he would circle Neverwinter with two or three of his subordinates. But sometimes, he would choose to head out alone—in theory, he was already the chief of the police department and the third most authoritative person within the kingdom's Security Bureau, so he didn't need to do any patrols personally. But he continued to do so as he preferred to get himself involved in the field rather than doing paperwork in the office.
He had already been in Neverwinter for a year and a half, and there were two things here that impressed him the most. The first was the exponential rate at which the city was expanding. It took him only half an hour to walk around Border Town when he first arrived, but now it would take him at least three times as long just to circle the city. That's not even including the harbor to the South and the farmlands to the east.