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1 trillion years = approx 31557600000000000000. However, the univere did not exist a rillion years ago and, according to current cosmological theories, it will not exist for a trillion years. So the answer is a meaningless exerise in multiplication.
It would take you until when the whole galaxy has cooled off, when there is no sun, and earth doesn't exist any more.Added:To be precise, 2740 years.
Twenty thousand years from now will be the year 22013. It is possible but it seems unlikely that we (if we still exist) will still be reckoning years in the same way. For all we know it will be year 1492 from the birth of Zapsock I, Emperor of The Solar System.
Brachiosaurs were the tallest dinosaurs ever to exist. They lived from the late Jurassic around 150 million years ago into the early Cretaceous. Both of those periods were part of the Mesozoic era.
Since the whole life of the solar system will be far shorter than this, it is a pointless exercise in multiplication. In about 4.5 billion years the earth will cease to exist and so there will be nothing that will define a year! However, since you asked, the answer is approx 94672800000000000000 seconds.