Hopefully never. To rebuild the Jewish Temple you would have to destroy the Dome of the Rock first which would intitiate a war between the jews and muslims wherein Israel would almost certainly use the nuclear weapons that it is not supposed to possess. To kill several million (maybe hundreds of millions) people for the sake of one building would be an obscenity beyond belief.
An interesting point about Solomon's original temple is that he could not have built it - or his palace (with its cedar columns) - without the aid of King Hiram of Tyre who sent his artisan masons to do the job for which the jews did not possess the necessary skills. Now Hiram was a Canaanite - a people that the Greeks referred to as Phoenicians - and who are known to us today as the Palestinians.
Funny old world innit.
ps The temple has only been destroyed twice - not many times - first by the Babylonians (just before they carted off the jewish elite into captivity (it was during the Babylonian captivity that the oldest parts of the Bible were first written down). Then - after being rebuilt by Herod the Great around the turn of the first century AD - it was again destroyed by Roman forces serving under the emperor Vespasian: first of the Flavian Dynasty, in 70 AD.