Why does the journey take twice as long on this trip from Dawson to Skagway in The Call of the Wild?

In "The Call of the Wild," the journey from Dawson to Skagway takes twice as long due to the harsh and treacherous conditions the travelers face, including difficult terrain and inclement weather. The group encounters obstacles such as deep snow, ice, and fatigue, which slow their progress significantly. Additionally, the physical strain on both the dogs and the humans exacerbates the situation, making the journey more arduous and time-consuming.