Mine took about under a week to get accepted. It's very unlikely that an application gets accepted in that short of a period of time. Most likely promotion to staff is much quicker and easier if you are active around the comminity, report rule breakers and make the overall player base enjoy their time on the server. It can take a week, months, even years in some instances.
Also put a lot of effort into it. Don't write it in 30 minutes and say "good enuf" Write and explain every argument you put in there with a low effort application it's very unlikely that it gets accepted anytime.
Wow, already a week since I got promoted? All I can say is that this is not as easy as it sounds on paper hah.
So far you've done an excellent job. You've been nice to the community and additionally very helpful. =)
Tip for those who hack: Please stop ruining other people's fun for your own enjoyment. It doesn't make you look cool just a bad pvper.