As-salaamu `alaykum.
It's from an infamous book. Sorry mirajmom, but it had to be deleted. The man who authored that book should bare in mind the saying, that one who tries to refute the scholars is like the one who spits at the moon; his own saliva lands back on himself (I believe the Shaykh responded to the book by saying that what was written holds some water, and that if he were to right a book refuting the author, it would amount to volumes)!!! If one were to actually read the works of Shaykh Al-Albaanee on the subject and pay attention to his statements, they will realise that he only condluded that following the Messenger, sall-Allaahu `alayhi wasallam, by praying 8 rak`ahs is better than following the companions and Imaams who prayed 20 rak`ahs, or praying 36 rak`ahs like the Maalikis, etc. Anyway, the difference of opinion here is of genuine differing, so let's not start claiming ijmaa`. In fact, the claim of ijmaa` would oppose a
mutually agreed upon hadeeth,
"Whether it was Ramadan or any other month, Allaah's Messenger, sall-Allaahu `alayhi wasallam did not pray more than eleven rak`aat. He would pray four - and do not ask about their beauty of length. Then he would pray four - and do not ask about their beauty or length. Then he would pray three".
[Agreed upon. Also recorded by Aby Daawood, At-Tirmidhee, An-Nasaa'ee, Ahmad, Maalik, Al-Bayhaqi, Abu `Uwaanah and others]
Imaam As-Suyootee said (see Al-Hawlee lil-Fataawee),
"We conclude that praying twenty rak`aat was not substantiated by his action, sall-Allaahu `alayhi wasallam. The hadeeth recorded by Ibn Hibbaan strongly supports our position of adhering to what Al-Bukhaaree has recorded from the hadeeth of `Aa'ishah, that he, sall-Allaahu `alayhi wasallam, did not pray, whether in Ramadaan or any other month. more than 11 rak`aat..."
He then mentions that the 3 rak`aat mentioned in the above hadeeth are the 3 for witr. The above was taken from Muhammad Al-Jibaly's excellent work on this subject titled
"The Night Prayers: Qiyaam and Taraaweeh". Anyway, the point here isn't to adamantly push the opinion that it is 8 rak`aat, as the `Ullemaa' differed. Rather the main point in me mentioning this, is due to the claim that there is ijmaa` regarding praying 20 rak`aat. How can there be ijmaa` if it is in opposition to the ahaadeeth of Al-Bukhaaree and Muslim!?
Also, it is better of course to follow the action of the Messenger sall-Allaahu `alayhi wasallam as we all know. Remember that Imaam Maalik said that,
"Everyone's opinion is either rejected or accepted, except for the companion of this grave", and then he pointed to the Messenger's, sall-Allaahu `alayhi wasallam, grave.
Akhi, Shaykh `Uthaymeen, rahimahullaah, mentioned that it is better that even if the Imaam is praying 20 rak`aat, that you stay behind and finish with the Imaam. The reason for this is due to the hadeeth which states that one who prays with the Imaam until he finishes, then it is recorded for him that he prayed the whole night. Hence if you pray 8 and then leave, you are short of this reward. I can't find the fatwa now, when I do I'll post it.
Hope it helps.
Wa`alaykum salaam