Matthew 24 is a crucial passage for understanding the second coming of the Lord Jesus Christ; however, it is one of the most difficult in the whole of Scripture and has been an exegetical battleground with no absolute consensus even among those who take the Bible seriously as God’s Word.

From Matthew 24:36 through 25:46, the passage is relatively unambiguous and clearly refers to our Lord’s answer to the disciples’ questions regarding his second coming. Certain things stand out. The theme throughout the parables of this section is that, unlike the destruction of Jerusalem in A.D. 70, there will be no warning sign, which believers can observe and then act upon. The time of the second coming will be utterly unexpected:

24:36 No one knows about that day or hour, not even the angels in heaven, nor the Son, but only the Father.

24:39 . . .they knew nothing about what would happen until the flood came and took them all away. That is how
it will be at the coming of the Son of Man.

24:42 Therefore keep watch, because you do not know on what day your Lord will come.

24:44 So you also must be ready, because the Son of Man will come at an hour when you do not expect him.

24:50 The master of that servant will come on a day when he does not expect him and at an hour he is not aware of.

25:13 Therefore keep watch, because you do not know the day or the hour.

Again, unlike the predicted destruction of Jerusalem within forty years (a generation, Matthew 23:36; 24:34), the Lord Jesus teaches the possibility that his second coming may be much further off than we might imagine. This is obvious in three of his parables in the discourse, as is seen from the following verses:

24:48 But suppose that servant is wicked and says to himself, ‘My master is staying away a long time.’

25:5 The bridegroom was a long time in coming, and they all became drowsy and fell asleep.

25:14, 19 Again, it will be like a man going on a journey, who called his servants and entrusted his property to them. After a long time the master of those servants returned and settled accounts with them.

you may also read Mark 13; Luke 21 here http://www.rbvincent.com/BibleStudies/matt24.htm