Obviously, the more you meditate, the deeper your work with this particular material will be. However, Bruce states in several places that it’s impossible to predict exactly how long it will take a particular person to reach a specific goal.
This is just my opinion, but there are two ways to think about this. One is to use your own intuition and self knowledge to guide you in how quickly you move through the material. The other is to trust the directions Bruce gives and just move through the material as he recommends. Of the two options, I recommend trusting Bruce’s schedule. You have nothing to lose by moving more slowly, but it’s possible that moving too quickly can leave gaps or weaknesses in the foundation of your practice.
There are a lot of things to consider here and I wish you the best of luck in your practice.