It is possible you could spend the remaining weeks working and re-working your series of panels. Regardless, you will most likely be experimenting and starting and stopping on other panels at the same time. The point of doing a series is not just about doing the same 3-5 panels for weeks and weeks. The point of the series is to learn and understand the value of working on multiple panels at the same time. Tremendous learning and progress can be made because the learning that occurs on one panel can then be applied to the other panels. It is this repetition that teaches us so much, so quickly.