Et al means and others or it can mean and elsewhere. When used in citing a reference it often means there are multiple authors of the work cited and the citation is for the first author and the others. John Smith, et al would mean John Smith and his coauthors.
1 NEW YORK: The 39th annual Macy's Firework Show over the East River will last for 25 minutes and draw a crowd of over 3 million spectators. As the biggest firework display in the US, this year's show features more than 50,000 effects. 2  WASHINGTON, DC: Lasting over 17 minutes, this show is among the largest in the US.
The duration and budget for your display are intrinsically linked. In our opinion longer does not always mean better. A wedding firework display would normally last between 6 and 15 minutes. For a public or corporate display we would recommend the display duration to be between 18 and 22 minutes.