It doesn't matter how fast one advances or learns, what matters is that one is still moving forward. Changing, learning and growing.
This image was taken with the Nikon D-80 and a kit lens that I haven't touched in years. Definitely not my good glass and I can tell the difference, but I wanted to carry my camera with me and I find it more comfortable with the D-80 and smaller lens.
Ambient light mixed with my garden lights.
Are you still pushing forward? If you are then it's time to celebrate. If you are not, why not? Pick up where you left off. What are you concentrating your efforts on learning?
Nikon D-300 User's Manual Pages 62-76
Getting Things Done by David Allen Pages 103-106