From 6 miles it takes 30 seconds from when you see a lightning strike until you hear the thunder.When the thunders comes earlier, the storm is getting closer. 3 miles is about 10-15 seconds and so forth, and anything closer is considered the Danger Zone!
If you find yourself here, here are some things to keep in mind:
Get indoors immediately. Even a car is relatively safe, as it stands on rubber wheels.
Lightning likes to hit the tallest object around. A football field for example would be a bad place to stand. Get off any field with no trees or structures around.
There are few ways to spot an incoming lightning strike.
"If your hair stands up in a storm, it could be a bad sign that positive charges are rising through you, reaching toward the negatively charged part of the storm. That's not a good sign!" - National GeographicSo what can you do if you're in the cross-hairs of a lightning strike like that?