Why is "40" by U2 so short?

I am not an owner of the music featured in this video. This video is made for educational and entertainment purposes only. I would appreciate your support to help me improve content creation production and experience for us all: Ko-Fi: https://ko-fi.com/johnflea PayPal: https://paypal.me/johnfleaddmr Thank you in advance. #u2 #reactionvideo #music #80smusic #postpunk