Qadha Salaah

Q: If Salatul Esha is missed by someone, then how many rakaats of salaah should be offered?

Q: I want to perform my qadha prayers. I will perform my qaza namaz after every obligatory prayers but I am worried about fajar and asar prayers. Please describe is it okay to offer fajar qaza namaz after fajar obligatory prayer and is it allowed to offer qaza namaz during asar and magrib prayer?

Q: Here the time of Fajr in Germany Offenbach is 6:00am, today I missed it and prayed at 08:30 as qada. Is this OK? I mean allowed?

Q: If I visit a place e.g. my grandparents which is at a distance greater than the safr distance from my home town for less than 15 days, is it permissible for me to leave out the sunnat salaah, despite having time to perform it, and perform my qadha salaah instead?

Q: Does qadha namaaz exist? Some people say the the prophet (Sallallahu Alayhi Wasallam) has not said anything like replacing a missing prayer. If it exists, when does maghrib namaaz become qadha?

Q: I have missed many namaaz in the past (as per my calculation 17-18 years namaaz). Now for the last one year I am regular in it. My question is regarding my qaza namaaz. I read that I have to perform my qaza farz namaz too. I read a short procedure of performing namaz too, in which I have to recite single time Subhana Rabial Azeem and Subhana Rabial Aalla only once, in Attahiyat short Darood shareef and in 3rd or 4th rakat Subhana Allah 3 times instead of Surah Fatiha, and Rabigfirlli 3 times instead of dua Kanoot. Is it valid? Do I miss my sunnatul Mukada and pray my qaza namaz and complete it as early as possible and then start praying my whole namaz after completing my all qaza namaz?

Q: Is it necessary to make Qadha of Witr should you miss it?

Q: A person performed his Esha and Witr Salaah on a particular day. Later, he realized that his Esha Salaah was not valid (after the time for Esha and Witr had expired). Should he just perform the qada of Esha (since it was invalid) or should he also perform the qada of Witr (even though he performed witr correctly)?

Q: When having multiple qadha salaah to read, what is the shortest way to read a salaah (if these are present, it's counted as done)?

Q: One is not aware when one became matured i.e. became baalig. To then calculate all one’s missed (Quaza) salaats from when one became mature, should the calculation be deemed from the age of 12 or 15?