Bonus re-use

Hey I was just curious if there were any figures on the bonuses from duplicate monsters? I know the tower event said that a +9 is ~15% cool down reduction on skill use. Are there any number on 1-10? It would make a lot of sense for events such as the recent clioangel event to keep repeating them to get a large reduction?

Someone did investigate the % of each bonus, the answer is in an old post, will search for it but will take time
Edit: Nvm found it fast

Thank you! Sorry I didn’t check back quite far enough.

Dont worry about it, Other people might want to know too so is good to bring this up, btw the data he got is not exact since the game seems to round up the seconds but should be close enough