The quick reply is usually between 1 and 4 hours on site. But the more accurate answer really depends on the scale of your property and how severe the damp problems are. It’s not just about the clock it’s about the work required. A small flat and a large detached house will naturally take very different amounts of time. https://www.damp-solutions.com/blog/how-long-does-a-damp-survey-take/