Hi Dara,
Sounds like you are still having fun and finding the lessons useful and productive. Why wouldn't you want to sign up for another year? :-)
Consider the cost of private lessons compared to the cost of GT and it's just silly. Plus, a private lesson is a one time experience and then it's gone! GT lessons are here for you again and again. Final point is anytime you start to feel discouraged or get stuck or have a question about anything at all, you've got this great forum with a supportive group of folks ready to give you all the support and encouragement you could ever ask for.
But hey, that's just like my opinion, man. :-)
Good luck,
Dave...
It takes as long as it takes unless you quit - then it takes forever and you will never get there.