In general, a significant lightning damage extends outward from the base of a thunderstorm cloud about 6 to 10 miles. It’s important to account for the time it will take for everyone to get to safety. The best approach, is to avert lightning strikes to your business by installing a lightning protection system by LEC. Then you can focus on doing business instead of getting back into business. Contact us for protection from lightning strikes: https://www.lightningprotection.com/