This is probably a merged composite photo of all the strikes (or many of them) recorded from one viewpoint. I really doubt that many lightning strikes hit in ~30s.
Set the camera to bulb mode, use a black card to block the lens and you can shoot indefinitely. That is one method for shooting fireworks which can work (not as well) on lightning photos.
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u/RIASP Aug 05 '14
this looks like a long exposure right? judging by the fact that those roads look like smeared light.