Ideally, there should be one responder-app command center for every 250 emergency call-for-help users, within a radius of 5 kilometers. However, the responders-to-coverage area ratio for achieving a 60-second response time can vary based on factors like emergency type, building layout, and population density. It's important to have enough responders, but other factors like training, equipment, communication, coordination, and drills also affect response time. These factors work together to improve emergency response procedures and overall efficiency.