Too long. Problem is with such a low pop, solo WEs can backcap your two main groups without much trouble. Normally what happens in this scenario is attackers will try to split into two main groups, holding different areas of the map (we tried to hold bottom 3, for example) but these two groups can easily just get backcapped by a solo or small group while you're trying to fight off a larger defending force, and as defenders have the advantage of being close enough in numbers (if not downright even during NA) and having a central location to fall back on and push from, it can be incredibly hard for attackers to actually do much of anything except run around aimlessly picking up flags that it took a 3-man to take, and the 3-man is just going to come back right after you leave (defenders literally just follow your flag rotation sometimes, avoiding a fight at all costs). The other issue is that if you actually fight a defending force that groups up intermittently, they can easily take out one of your two groups and put you back even further.
In the situation in the video, there is no reason whatsoever that an NPC should be denying attackers a win.