The total timeline for sewer replacement in NYC depends on the permit process and the scope of work. Permit acquisition typically takes 2-4 weeks for standard projects and 1-3 days for emergencies. The physical replacement work usually takes 2-5 days for a standard residential sewer line. Street restoration adds another 1-2 days. So the total timeline from start to finish is typically 3-6 weeks. Factors that can extend the timeline include complex underground conditions, large pipe sizes, long distances, weather delays, and permit complications. Trenchless methods can often reduce the physical work to 1-2 days.