I got a relaxer after 9 weeks. I could have gone longer, but I have an important event coming up, and I didn't want to have to deal with my new growth for that. I got a little trim because my ends seemed a little scraggly to me.
I'm officially claiming armpit length! It took a little longer that I expected, but I'm glad I can close out 2010 having reached my length hair goal. Now, I'm working on my thickness goal even more. Whatever additional length I achieve is great, but I'm really focusing on thickness and moisture. If I can improve upon those, I plan on getting a full trim after my next relaxer in 12 weeks.