No, it has to do more with the reason for your color choices/motivation for your plan.
There is no min/max for discolor time and it doesn't have to be 100% discolored yet (some take weeks or even months for 100%!) I will just have to see the point. Most FO's take no more than a few days though for you to get most of the discolor. That means for this challenge there will be less last minute entries. It will require more planning. I will need a picture of the soap no less than 3 days after it is made. I'm also going to ask for a picture of it in the mold.
Ok, no more, you will all get more details in the main post on Monday evening. I'm making my soap Saturday with a video.
ETA: Yes, mikes honey discolors to really nice caramel color and violet (although it accelerates) goes to beige. I'm also pretty certain creme brulee discolors (I have it but I haven't soaped with it. It smells very similar to the honey).
Oh, and your color does not have to discolor just to brown. It can be reds/ oranges/ yellows (or any color) discolor too!