Armies and traders have to move the distance to their target across the map before they can launch an attack or make a trade.
One map slot equals one square with half a meter length. This way, the expected travelling time can be calculated in combination with the movement speed of each individual unit.
An Army contains 20 Spear Ants and 50 Knights and is ordered to attack a colony in 5 metres distance. Knights move at a speed of 6 meters per hour, Spear Ants manage 4 meters per hour. This concludes in the army's move speed of 4 meters per hour. For the path to the target colony, the army will take 1 hour 15 minutes in one direction - the entire attack (way there and back if the army survives) will thus take 2 hours 30 minutes.