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Apparently there's something called "anvil crawler" lightning that can work its way across a cloud.
https://en.wikipedia.org/wiki/Lightning
https://en.wikipedia.org/wiki/List_of_lightning_phenomena
But in the video I see of it, while it's sustained by lightning standards, it all looks much shorter duration. This video is titled "Epic 3.72 second anvil crawler lightning", so over a minute seems unlikely.
Are you sure that it's not an aircraft, maybe illuminated in one way or another (e.g. a break in the clouds in the distance letting sun illuminate it directly, maybe?)
This would have been a very low flying aircraft, flying directly in to a very energetic thunderstorm! I have the 100MP original stills too, and there is no sign of an aircraft that I can make out
considers
I still like the idea of an object, because it'd explain the slow and constant speed. I wonder if it's possible for a conductive object, like aircraft, to induce strikes by being more-conductive than air. If it were flying along and there were a series of strikes on the aircraft. I can find footage of aircraft being hit by lightning in-flight, but not of one being hit repeatedly, though.
This is a post processed cropped version of one of the original stills. I have a hard time believing there's an object behind it...