Answer: It is compulsory to perform all Qada Salahs as quickly as possible. One cannot say when death will come. There is no difficulty in performing 20 Rak’aat daily ( i.e., 2 Rak’at of Fajr, 4 Rak’at of Zuhr, 4  Rak’at of Asr, 3 Rak’at of  Maghrib, and 7 Rak’at for Isha, i.e., 4  Fard and 3 Witr.)  One can perform all these Salah anytime of the day except at the time of sunrise, Sunset and Mid-Day (Zawaal) as Salah is not permissible at these times. One has the option to perform all the Fajr Qada first, then Zuhr, Asr, and Maghrib and Isha, or each one along with all daily Salah. A maximum estimate record of all the Qada must be made and performed accordingly. It is better to perform more than the estimated Rak’aat, but not less. If one daily performs in this manner to the extent of your strength, then all Qada will eventually be completed. So, do not delay or be lazy to complete them. No optional (Nafli) Salah is accepted if one has Qada Salah of any Fard Salah.

Intention for Qada Salah can be made in the following manner. For example, you have 100 Fajr Qada. Every time you perform one Qada, say, “I intend to perform my first Fajr Qada.” In this way you will perform them all. The same method may be used to complete all Qada Salah. If one has a lot of Qada to complete, then one must perform them quickly in this way. One may recite (سُبْحٰنَ اللہ) 3 times instead of Surah Fatihah only in the empty Rak’aat (the third and fourth Rak’aat in 4 Rak’aat Fard (i.e. Zuhr, Asr and Isha) or the third Rak’aat in 3 Rak’aat Salah (Maghrib). There is no harm if one recite one Tasbeeh سُبْحٰنَ رَبِّیَ الْعَظیم and سُبْحٰنَ رَبِّی الْاَعلٰی instead of three in the Ruku’ (bow) and Sujood (prostration). The Fard will be completed. One may recite this Salat (Durood)  اَللّٰھُمَّ صَلِّ عَلٰی سَیِّدِنَا مُحمَّدٍ وَّاٰلِہٖin Tashahhud instead of both Salat (Duroods). In Witr, read رَبِّ اغْفِرْلِیْ once instead of the complete Du’a-e-Qunoot.

One can perform Qada Salah 20 minutes after sunrise and 20 minutes before sunset. It is not permissible before or after these times. One must also perform these Salah in secrecy, as the exposure of sins in public is not permissible.