How large and powerful can a lightning strike get?

We had storm and tornado warnings all afternoon and up to 9:00 PM. Most of it missed us, but a little after six PM a huge lightning strike hit fairly close to use. This thing was massive. It was 2000 to 3000 feet away, because it took a few seconds for the thunder to get to us, but the snap was extremely loud. Normally you have to be very close to hear that. Then the thunder was massive and shook the entire house, and it went on for a good 20 seconds. I have never heard such a massive strike. And I’ve been in a house when it was hit, twice.