To achieve the benefits of cardiovascular activity, most health organizations, including the American Heart Association and the World Health Organization, recommend a minimum of 150 minutes of moderate-intensity aerobic exercise or 75 minutes of vigorous-intensity aerobic exercise per week. This can be broken down into about 30 minutes a day, five days a week.
Even shorter bouts of activity can be beneficial, so it's important to do what fits your lifestyle while ensuring consistency. For health benefits, some activity is better than none, and even brief episodes (like 10-15 minutes) can contribute positively when accumulated throughout the week.