Since a month or so after the site was founded.

I've been here for over three years on 4 different usernames because either I hated my last one or forgot the password

2 or 1 and a half, I guess. I wasn't able to see the dinosaur thing tho, which I think is a good thing

About 2 and a half years

About 2/3 of a year. I feel so young compared to all of you

I've been here for a looooong while...