When someone asks me how long their fence is going to take, they don't want “it depends” as the answer, even though it genuinely does depend on the job. I build fences around Christchurch every week, so here's a straight answer with the two most common scenarios, and what actually moves the timeline up or down from there. How Long Does It Take to Build a Fence in Christchurch? The short answer. For a 20 metre fence with nothing to remove first, I can generally get it built in