How long does it take to NOT be considered a 'New User'. Is it reputation, day/hour based?
None of these answers are really correct. There are special limitations for Rep 1 users.
New user (less than 15 rep) restrictions:
- new users may not post images
- new users may only post one URL
New user (less than 100 rep) restrictions:
- new users may only post one question every 20 minutes
- new users may only post one answer every 2 minutes
To lift these restrictions, gain more rep!
It is reputation based. See "What is reputation?" in the faq.
Amass enough reputation points and Super User will allow you to go beyond simply asking and answering questions:
15 Vote up
15 Flag offensive
50 Leave comments
100 Vote down (costs 1 rep), create new tags
200 Reduced advertising
250 Vote to close or open your questions
500 Retag questions
750 Edit community wiki posts
2000 Edit other people's posts
3000 Vote to close any questions
10000 Delete closed questions, access to moderation tools
At the high end of this reputation spectrum there is little difference between users with high reputation and moderators. That is very much intentional. We don't run Super User. The community does.
The limit goes away once you hit 100 reputation
I'm still a "new user" and I've been using this site for seven months. Essentially, you're a new user until a bunch of people get together and decided to vote you up. I know... It really has nothing to do with new, but like most bugs no one seems to care to fix it.