Board Thread:Naruto Discussions/@comment-25691159-20200529162803/@comment-9782468-20200530160434

They're just inextinguishable by conventional methods lol.

They're quite obviously not eternal anyways.

You're just taking one statement about the jutsu and trying to say any other showing/statement about them is now wrong if they don't correlate. But plenty of times a jutsu is described to do something and then is eventually shown not to.

Chidori, the sword that cuts anything? Stopped by by Lightning Armor.

Susanoo, the ultimate defense? Broken by several people.

Gaara's shield of sand, the ultimate defense? Bypassed by Chidori and Rock Lee.

Amaterasu just burns for 7 days and 7 nights or until the target is completely incinerated. Or the user extinguishes them.