God only knows the instant, the moment it all gos down.
BUT:
He did give us the season, that is to say, generation. That generation in which All the events He listed in the Bible, takes place.
It is called the generation of the fig tree, and you are living in that Generation now. The parables and teachings, teach it started when Israel became for the first time a nation. That happened in the year 1948 . So, the fig tree generation now has some years on it. That being the case, you do NOT want to be caught off guard . And you don't want to fall into a bed with a false Christ. Do you remember the five foolish virgins ?
In a spiritual sense, they were not virgins anymore ; by the time the True Christ returned. Did you know that there are Two Jesus ?
If you do not know that, your hurting for truth. ( Amos 8:11 kjv )
There were three designations for how long it could, be: one went into the triple digits .I cant remember the exact amount each was at the moment . But to play it safe it will be as long as God wants it to be.
One thing Christ said to us was "Watch". And you should . Many of the signs has taken place, like Israel setting up as a nation. Wars and rumors of war. And the earthquakes . But most important, is the deception; where by we know its the last time.
But Christ warned very seriously: He would Not return, until there was the apostasy first ; and that man of sin be reveal the son of Perdition. Once you study enough of God's words; You should find that son is Satan himself in person.
It's only after that , that Christ returns . One way you can tell, that Christ is here is, if your still in a flesh body here on earth, and some one is claiming to be God and or Christ; then Christ has not returned.
If however, your in a spiritual body , a change has taken place, and your on earth, that means the Christ has returned an that changed took place.
One thing your going to want to be doing in the mean time, is, put on ALL the Gospel Armor ON. The reason we do that is to stand against all the fiery darts of Satan .
If you don't know any of this, then pray for help; study the Bible everyday .