What is the normal period for a wet dream to occur after stopping masturbation? Are there ways to stimulate it, and is seeking a wet dream considered natural?

As long as you have repented from the forbidden masturbation, then praise Allah and remain steadfast in your repentance. Be diligent in obeying Allah and avoid the paths that lead to relapse. Do not invite sexual fantasies, and if any overcome you without being invited, you will not be held accountable for them. Do not preoccupy yourself with the cause or trigger of a wet dream; instead, occupy yourself with obeying and worshipping Allah. If you have a wet dream and see semen, then ghusl (ritual bath) is obligatory upon you; otherwise, it is not. As for seeking anything beyond that, it is of no consequence.