Allah's Apostle (Sallallahu 'Alaihi Wa Sallam) talked about Friday and
said, "There is an hour (opportune time) on Friday and if a Muslim gets it
while praying and asks something from Allah, then Allah will definitely
meet his demand." And he (the Prophet S.A.W) pointed out the shortness of
that time with his hands.

Bukhari Vol. 2 : No. 57

—