There are many Athkar you can say as described by our Prophet salla Allahu alaihi wa sallam.

Subhana raby al atheem as many times you want.
Also you may add: subuhun qudus rabu al -malaikati wa ruh

Our Imam during Tahajjud will do ruku for like 3 to 5 minutes. Is this ok and what should be recited after the normal azkar? The sujud is prolonged too but I understand that one can pray their desire in sujud. Is it ok to prolong that long?

Taraweeh, Tahajjud and Qiyam-ul-Layl | July 3, 2016 3:41 am
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I am working in mnc company. I cannot be awake whole night in Ramadan as I have to work 9 hr next day. Will Allah reward me atleast 40-50 years of ibadah out of 83.3 year (night of qadr better than 1000 month)if I do worship till 12 am?
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Sheikh what is the ruling on reciting a long dua after the dua e qunoot in salatul witr? As some oppose it by saying that there is a ruling of sheikh albani that he said a long dua in witr should not be done. Pls can you throw some light upon this.