That depends a lot on what your goals are. Typically, it is considered important for the sake of your health not to take the drug continuously. You will want some time away from the drug in order to give your body the time it needs to recover. This can be invaluable time for your liver to flush out toxins and return to a healthier state before you begin again. Consider a 10-week cycle of the drug. For the last two weeks, gradually reduce the dosage to help get your body off of it before stopping completely. This will help to reduce issues regarding side effects.
Regarding the proviron, I mainly added it to cut some water gained on the test enanthate (I eat 100% clean but carbs are Not my friends, unfortunately). Also I wanted to improve my Sex life with girlfriend. I am really happy with the decision to Add Dragon Pharma proviron to my Cycle: vascularity improved a lot, morning wood back again, lot more Libido and I was able to cut some water, much more satisfied when looking into the mirror every morning.
Side notice: used Pharma proviron from bayer before in the past a lot, Dragon pharma are as good as them!