I created a cost map from an elevation map an a (degree) slope map using r.walk (version released on 2015-03-12) in QGIS 2.14.3. According to the documentation the resulting map should display the time needed to reach each raster cell from my starting point. As far as I understood, the unit of time should be seconds. I wanted to mask the area reachable in 3600 seconds, but it is only about 800 m wide on more or less flat terrain.
Could the unit of time be something else than seconds? Or is there some other error in my thinking.