Why does "modify duration" of cinematic transitions do absolutly nothing?

I have a lot of text cinematic transitions and the text rolls by far to quickly on some of them and the modify duration value and wait does absolutly nothing I've noticed.

It works. You are doing something wrong. Post your triggers. Remember game time != real time.

I think it has something to do with sounds.

Cinematic - Send transmission to (All players) from Perinspeech named Perin: Play No sound and display Such vivid beauty. .... Modify duration: Add 45.00 seconds and Wait

This does abolutly nothing, the text skips by in about 5 seconds.

try instead of add, use "set to" 45 seconds

I see no triggers. If I had seen triggers, you would have copied the trigger as text and then used trigger tags. If you want help, at least put the effort in.