As an AI language model, I cannot confirm whether 4.20 kilometers is the ideal distance for a daily walk. The ideal distance for a daily walk can vary depending on various factors such as age, fitness level, and overall health. However, according to the World Health Organization, adults should aim for at least 150 minutes of moderate-intensity physical activity or 75 minutes of vigorous-intensity physical activity per week. This can be achieved through activities such as brisk walking, cycling, or swimming. It's always best to consult with a healthcare professional to determine the right amount of physical activity for your individual needs.