Jesus said he will come when we least expect it
I believe Matthew 24:44 is a warning against our becoming unfaithful, for Christ will come like a thief for us only IF we fall asleep spiritually (Revelation 3:3, 1 Thessalonians 5:4-6). Otherwise you're saying that as long as we're looking for him he can't possibly come.
"But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only. But as the days of Noe were, so shall also the coming of the Son of man be" (Matthew 24:36-37).
Here I believe Jesus is referring to the same "coming of the Son of man" as when he said "immediately after the tribulation of those days... they shall see the Son of man coming" (Matthew 24:29-30). I don't believe he taught a 3rd coming.
Note that Jesus didn't say "no one will know the day" (future tense) but "no one knows the day" (present tense).
Note the exact correlation of the phrase "knoweth no man" in Matthew 24:36 and 1 Corinthians 2:11-12: "Even so the things of God knoweth no man, but the Spirit of God. Now we have received, not the spirit of the world, but the spirit which is of God." See also: "When he, the Spirit of truth, is come, he will guide you into all truth... and he will shew you things to come" (John 16:13).
Jesus said his coming would be "as the days of Noah were" (Matthew 24:36-37). God told Noah when the flood would come shortly before it came: "For yet seven days, and I will cause it to rain upon the earth forty days and forty nights" (Genesis 7:4). He told him because: "Surely the Lord GOD will do nothing, but he revealeth his secret unto his servants the prophets" (Amos 3:7).
Shortly before the 2nd coming, I believe the Lord will likewise through his Spirit reveal to his prophets in the church the day of his coming. I believe those of us alive and still faithful at the abomination of desolation will know that we'll have to wait only 1,335 days until Jesus comes: "From the time that the daily sacrifice shall be taken away, and the abomination that maketh desolate set up, there shall be a thousand two hundred and ninety days. Blessed is he that waiteth, and cometh to the thousand three hundred and five and thirty days" (Daniel 12:11-12).
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