But then I stopped sitting altogether sometime around December 2013
I've gone longer than this without sitting between cycles. I never noticed a problem with it as any realizations due to paths are permanent. Sitting will just start you right back where you left off. However, you'll probably have to start the insight cycle process from the beginning that follows the last cycle completed. I tend to start out with short 20-30 minute sits if I haven't sat for a while.