[ Vanitas also isn't so convinced that the inhabitants of this World don't know more than what they are telling them. However that's not really something he can prove, though he would like to. Being validated in his concerns would be a nice change in pace. ]

Not as long as one would imagine. All anyone has to do is simply hold hands. Of course you get more if you do other things, but point is you get Chroma for basically doing nothing.