What is the estimated gameplay time to complete it?

(think I'm done editing) https://v1.steam.hlxgame.cc/sharedfiles/filedetails/?id=2490361670 This is a grammar mistake, if the following word after a or an, starts with a consonant, then 'a' is used, if it starts with a vowel, then 'an' is used. The text is New Horizon. https://v1.steam.hlxgame.cc/sharedfiles/filedetails/?id=2490361596 This plaque on the wall shows me the symbols I'm supposed to use. https://v1.steam.hlxgame.cc/sharedfiles/filedetails/?id=2490361503 But the third drum, the one to the right...

I've done a playthrough where I used the red, yellow and blue mandalas, but I'd like to find all the green paint as well. So far I've found the green paint for the first mandala, but none of the others. Has anyone found them all?