How much time should be added to a journey for every 200 metres of steep ascent using Naismith's rules?

According to Naismith's rules, you should add 10 minutes for every 200 meters (656 feet) of steep ascent to your journey time. This guideline helps account for the increased effort and time required when climbing. Additionally, it's recommended to add an extra 10 minutes for every hour of walking, to account for breaks and variations in terrain.