Answer:
Assalâmu’alaikum Warahmatullâhi Wabarakâtuh
Dear brother,
It is permissible to perform Qadha Salaah after the Salaah of Fajr has been performed, and similarly after Asr Salaah has been performed with the condition in Asr Salaah that Qadha Salaah is performed before the Makruh time sets in, approximately 15-20 minutes before Maghrib Salaah. If Qadha Salaah is read in this Makruh time, it will be invalid. (Umdatul Fiqh vol 1 pg. 344, Ascent to felicity 71-72)
AND ALLAH TA’AALA KNOWS BEST
Muhammad Z Panchbhaya
8th April 2013
27th Jumadal Awwal 1434