is there a specific time to read qada namaz?
Fajr is Qada as the sun rises
Dhuhr gets Qada when it is time of Azan Al Asr
Asr gets Qada when its time for Maghrib
Maghrib Gets Qada as the sunlight completly goes
Isha Gets Qada at 12:00
As for Fajr you can perform as the sun rises, but that will be Qada.
As for Dhuhr, you cant perform after Asr but after Asr there are 2 Rakah`s that can be performed
Aisha (may Allah be pleased with her) said: Anytime Allah’s messenger (peace and blessings be upon him) came to my house after Asr he prayed two Rak’ah [Bukhari 593 ] The scholars’ analysis about these two Rak’ah turntoIslam.com
Imam At-Tahawee (may Allah have mercy on him) said, “Some people see no harm in praying two Rak’ah after Asr and consider them a Sunnah.” [Sharh Ma’anee Al-Athar 1-301] turntoIslam.com
Dhuhr can be performed i think 100% after Maghrib,not sure
if you perform Maghrib after the sunlight completly goes, then it'll be Qada