You can see my hair length in my avatar (it's just a little longer now). I use 4 quarter sized blobs on my hair. I think I could probably use more, but I also use AVG, and I think my hair would just get a little over saturated with product if I increased the amount. Sometimes I water down the KY too (about 50/50), but lately I've been short on time, so I just scrunch it in full strength.

FYI- you can get the generic Walmart brand for less than $2. I've used the KY brand (~$6?), the Walgreens generic brand (~$4), and the Walmart generic brand (~$2) with the same results. When I saw how inexpensive it was, I just went ahead and purchased 4 or 5 tubes...that was an entertaining checkout!
CG Since 5/23/09
3a - High Porosity / Coarse Texture on Crown, Medium Texture Beneath
CO Wash: Trader Joe's Tea Tree Cond.
Condition: Salon Care Honey Almond Cond.
Gel: Biotera gel
DT: Honey, conditioner, EVOO(1x/wk)