There is no set time, the admins want to see people who participate in the Forum discussions first and foremost,, please think of this as a community of gun lovers first, with the bonus of a trustworthy equipment exchange for the most part.
By participating, people get to know you, trust is built, and this reduces the chance of being scammed greatly.
Fastest way to get approved is by getting your post count up and participating in the forum discussions. Sad reality for some, gun forum FIRST, EE far behind. Hope this helps you to understand the wait, you joined in January and haven't posted at all, most guys here probably wouldn't deal with you for a while at this point.