I have an option in the settings, that won't be avaliable for the user for about 2 weeks.
I have considered a number of options:
Leave it out - make it suddenly appear
Keep it faded out, and become avaliable after the time
Have a countdown (this can vary based on user actions though).
I could go for one of the options, and none are awful but I wonder if there is a better option.
I have some questions for you:
Your case is a bit of an unknown to me, so here's some general advice:
I hope some of this helps you make a decision.