Qadha for fasts that were broken due to masturbating
Q:
1. Prior to 1 year earlier, I did not know that masturbation breaks the fast and I used to do it in the state of fasting. Do I still have to make qada even if I did not know it at that time?
2. If yes, how should I calculate how many fasts I should make qada for? I am not sure how many of my fasts were broken like this. How many qadas should I make if I did not know this for 5-6 years after becoming baligh?
3. Should I make qada for all the fasts for the past 5-6 years or is there a specific number I can keep to make it alright?
4. Am I obligated to keep all the qada fasts together or can I keep them once or twice a week?