Until the times of the Gentiles be fulfilled
Luke 21:20 But when ye see Jerusalem compassed with armies, then know that her desolation is at hand. 21 Then let them that are in Judaea flee unto the mountains; and let them that are in the midst of her depart out; and let not them that are in the country enter therein. 22 For these are days of vengeance, that all things which are written may be fulfilled. 23 Woe unto them that are with child and to them that give suck in those days! for there shall be great distress upon the land, and wrath unto this people. 24 And they shall fall by the edge of the sword, and shall be led captive into all the nations: and Jerusalem shall be trodden down of the Gentiles, until the times of the Gentiles be fulfilled.
Clearly this is a reference to AD 70. Jerusalem was destroyed, it was "the time of vengeance" and that was so that "all things would be fulfilled". There are many words and prophecies in the OT that if Israel did such and such that this would be the result. But look at how it concludes "until the times of the Gentiles be fulfilled". When the temple is destroyed then it is the official start of the times of the Gentiles. Doesn't seem right, the 69th week ends when the Messiah "Is cut off", that was at the cross. However, the Jewish nation was given 40 years to repent. It isn't fair to blame the entire nation for what a few Jewish leaders did in Jerusalem. So although the times of the Gentiles can be said to have started with the crucifixion of Jesus, the Jews still had 40 years to repent. We see this on probation periods where you get a job but they can terminate you for any reason in the first three months. Or it is like buying something with a credit card and you have 30 days to return it no questions asked.
So then, when does the times of the Gentiles end? Not in 1948, at that time the Jews did not even control Jerusalem. Not in 1967, at that time no one even recognized Israel's right to Jerusalem. In 2017 we got much closer when both the US and UAE recognized Israel's capital as Jerusalem. When Israel got the Red Heifers that they will need to sacrifice to begin the building of the temple and all the sacrifices we were even closer.
At this point we could hear they have started the construction of the temple at any moment. The temple should not take very long to build, it is supposed to be a prefabricated building that they simply put together. The foundation is also supposed to already be in place. If you have a hundred or even a thousand well trained "levites" working on this it could be done incredibly quickly. It is impossible to estimate, but other prefabricated buildings are put up in a matter of days and they don't have a tenth of the people who will probably be working on this. Knowing the Jews this will probably be done with military precision as quickly as possible so people don't have a chance to object.
Now think about it, the times of the Gentiles is plural, two thousand years instead of one. The times of the Jews was also two thousand years, Abraham to Jesus. We are told that during the times of the Gentiles the temple will be destroyed and the Jews will be scattered to the wind. However, when they return to Israel, to Jerusalem and rebuild the temple then the times of the Gentiles will be fulfilled. So how can anyone think the verses following this about the fig tree sprouting again indicates that summer is near, and this generation will not pass away until all these things be fulfilled, could possibly be referring to a time prior to the times of the Gentiles being fulfilled?