I've been growing it out for about 9 months. I work full time but made sure people around me knew I was planning to grow it to my shoulders, like I had it in college. Only one person, my boss, asked me why and I said "because I still can."
It's about 4" now, and I don't use the wig anymore. I back-comb to build some body, and wear bangs to cover my cave man forehead and widow's peak, and I pass pretty well if no one is paying much attention.