*Audio credit from almohisni website*
Suratul Kahf is a Makkee surah (revealed before the hijrah) between the 8th and 10th year of Prophethood when the persecution was at the highest peak. It was revealed after Suratul Ghaashiyah (88). It has 110 ayaat (verses), 1,577 words, and 6,360 letters.
SURAT AL-KAHF ON A FRIDAY
We are encouraged to recite/read Surat Al-Kahf on Fridays. This is something proven from the Sunnah of the Prophet [SAWS]. Below is an excerpt from IslamQA.com on the authentic traditions from the Prophet about Surat Al-Kahf.
There are saheeh ahaadeeth from the Prophet (peace and blessings of Allaah be upon him) concerning the virtues of reciting Soorat al-Kahf during the day or night of Jumu'ah (Friday). These include:
(a) From Abu Sa'eed al-Khudri, who said: "Whoever reads Soorat al-Kahf on the night of Jumu'ah, will have a light that will stretch between him and the Ancient House (the Ka'bah)."
(Narrated by al-Daarimi, 3407. This hadeeth was classed as saheeh by Shaykh al-Albaani in Saheeh al-Jaami, 6471)
(b) "Whoever reads Soorat al-Kahf on the day of Jumu'ah, will have a light that will shine from him from one Friday to the next."
(Narrated by al-Haakim, 2/399; al-Bayhaqi, 3/249. It was classed as saheeh by Shaykh al-Albaani in Saheeh al-Jaami', 6470)
The soorah may be read during the night or the day of Jumu'ah. The night of Jumu'ah starts from sunset on Thursday, and the day of Jumu'ah ends at sunset. Therefore the time for reading this soorah extends from sunset on Thursday to sunset on Friday.
[IslamQA.com]