The task of the Prophet (saws) is to warn those who fear it.

As such, do not think of the Hour, but rather work to prepare for it.

Anas bin Malik (May Allah be pleased with him) reported that a person asked the Prophet (saws) about the Last Hour? Thereupon the Prophet said:

 (What preparation have you made for the Last Hour? He said: Nothing, except that I love Allah and His Messenger. Thereupon the Prophet said: You would be along with the one whom you love.)[1]

The Prophet (saws) did not tell him about its timing, because Allah (swt) said to him: (In what [position] are you that you should mention it? (43)), so, the Prophet answer was about the preparation that person has done for it.

[1] Sahih Al-Bukhari, Book of virtues of the companions, hadith No. 3485.