Change sound effect

[Dorabella]

As the title suggests, I'm mixing the sound effects ( Here for more details  WIP] Skyrim + FFVII menu sound ) . After spending some time searching for the sounds I wanted, I ran into a problem:

The effect chosen is more lingo than the spell and this implies the lack of complete execution (it does not end with the explosion) but it stops at the end of the spell. I tried to modify the spell with TES5Edit, but it is not possible to change the duration so that it can get the full sound. Any advice on changing the spell duration?

 

PS.: The spell selected is purely demonstrative 

 

Spoiler