What is the ruling on one who intends to perform i'tikaf (spiritual retreat in the mosque) for one hour

Question:
Shaykh Salih, is staying in the mosque for a whole night or part of the night considered i'tikaf?

Answer:
Yes, it is called i'tikaf. Sitting in the mosque to draw near to Allah (Glorified and Exalted is He) and to obey Him is considered i'tikaf. It may be for a night; 'Umar ibn al-Khattab (may Allah be pleased with him) vowed to perform i'tikaf for a night in the Sacred Mosque and asked the Prophet (peace and blessings be upon him), who said, "Fulfill your vow." I'tikaf for a night, i'tikaf for a day, and i'tikaf for hours are all considered i'tikaf. Yes.