One bolt is usually enough to finish off a careless person. I have a healthy respect for lightning. About 15 years ago, I was working in the back garden when a storm started building. I was sure the danger was at least 20 minutes away until a stray lightning bolt hit the ground about 100 feet from me. Needless to say, I set a world land speed record to the basement door.
Lightning is a real danger, so play it safe.