Is it obligatory to re-perform past prayers missed due to ignorance of the rules of purification, regardless of their large number, or is there a way to mitigate or waive their re-performance because of their multitude?

Scholars have differed regarding the obligation of making up prayers for someone who omitted a condition out of ignorance. The majority obligate it, while some have gone to the opinion of no obligation, and this is a strong opinion. However, making them up is more cautious. All missed prayers must be made up, except for prayers missed due to menstruation. They are estimated if precise calculation is impossible. One must be cautious not to make up prayers based on baseless waswasa (whispers/obsessive thoughts) or ungrounded doubt. Making up prayers is obligatory for one who is certain of having omitted a condition or a pillar, but doubt after prayer holds no weight.