‘ And they went, and came to the mountain, and stayed there three days until the pursuers were returned, and the pursuers sought them in every part of the way, but did not find them.'
The mountain was Jebel Quruntul, a desolate ridge to the west of the city, full of caves and ravines, an ideal hiding place. Meanwhile the searchers searched every bit of the area between the city and the river and obviously did not find them.
“Stayed there three days.” This could have been any amount of time from one and a half days to four or five days, or even six days. ‘Three days' simply means ‘a number of days but less than seven'. The next description up would have been ‘seven days'. Possibly Rahab had given them food, but these were trained men, they would know how to find food.