Using the info from another message posted, I was able to find a 20 minute fireworks display with even a grand fanale! Took me a bit to find the exact time.
Go to Washington DC on any year's July 4th at 10:00pm and the beautiful display will last for a whole 20 minutes. You can also see them at the same day and time over the Statue of Liberty in New York. I'm sure there are other cities too. Tried San Diego (my town) but they weren't there.
It's actually worth watching the whole thing, becuase it doesn't just repeat the same sequence over and over. The detail is so good, you can see the lauching of the rockets on the boat and some of the lit sparks fall to the water. They even leave smoke tufts that float away. The grand fanale starts to build up in the last 2 minutes so if you just want a good short version, just set the time to 10:18pm!
Enjoy and happy 4th of July from a United States Marine! Oorah!
MARINE PLANES DOMINATE!