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I am a Theravada Buddhist and as far as predictions go here's what i was able to find...
The coming of Maitreya will be characterized by a number of physical events. The oceans are predicted to decrease in size, allowing Maitreya to traverse them freely. Maitreya will then reintroduce true dharma to the world.
His arrival will signify the end of the middle time, the time between the fourth Buddha, Gautama Buddha, and the fifth Buddha, Maitreya, which is viewed as a low point of human existence. According to the Cakkavatti Sutta: The Wheel-turning Emperor, Digha Nikaya 26 of the Sutta Pitaka of the Pāli Canon), Maitreya Buddha will be born in a time when humans will live to an age of eighty thousand years, in the city of Ketumatī (present Varanasi), whose king will be the Cakkavattī Sankha. Sankha will live in the palace where once dwelt King Mahāpanadā, but later he will give the palace away and will himself become a follower of Maitreya Buddha.[15]
The scriptures say that Maitreya will attain bodhi in seven days (which is the minimum period), by virtue of his many lives of preparation for buddhahood similar to those reported in the Jataka tales.
At this time a notable teaching he will start giving is that of the ten non-virtuous deeds (killing, stealing, sexual misconduct, lying, divisive speech, abusive speech, idle speech, covetousness, harmful intent and wrong views) and the ten virtuous deeds (the abandonment of: killing, stealing, sexual misconduct, lying, divisive speech, abusive speech, idle speech, covetousness, harmful intent and wrong views).
The Arya Maitreya Mandala, founded by Anagarika Govinda is based on the idea of the future coming of Maitreya.
Pali sources say that beings in Maitreya's time will be much bigger than during the time of Sakyamuni. In one prophecy his disciples are contemptuous of Mahakasyapa, whose head is no larger than an insect to them. Buddhas robe barely covers two fingers making them wonder how tiny Buddha was. Mahākāśyapa is said to be small enough in comparison to cremate in the palm of Maitreya's hand.[16]
Here's the thing about the periods of time in different Sasanas of Buddhas. It is a matter of how long the humans live.In the time of our Lord Buddha maximum human life expectancy was 120-125 years.But in next Lord Buddha's era it will be way longer, Therefore that Lord Buddha's Sasana will hold on for a long time.