Any Tips for Dyeing a Doll?

I want to make my own custom tan-Licca-Chan, (I don't mind if she comes out darker than tan). But I was wondering how others on here may have dyed their own dolls? Most dolls are made of slightly different plastics. For example Licca has a hard plastic torso, but soft plastic limbs and head.

I'm wondering if the different types of vinyl/plastic will require different dyeing times? I've seen a few tutorials but they seem to be for resin BJDs. Any advice/tips and recommendations are much appreciated!