How far did the Jews travel to Jerusalem for the feast days?

Jewish pilgrims traveled hundreds, sometimes thousands of miles to Jerusalem for the religious feast days. At Pentecost, devout Jews came from every nation under heaven, including regions as far away as India, Babylon, Syria, Greece, Rome, Spain, possibly Great Britain, and North Africa.

Les teaches that the Jews were dwelling or abiding at Jerusalem because it was a feast day, specifically Pentecost, and they were devout men out of every nation under heaven. He explains that they had come hundreds, sometimes thousands of miles for the feast days at Jerusalem. They came from places as far east as India, Babylon, Syria, Greece, Rome, Spain, maybe even Great Britain, and North Africa. All these Jews would come back to Jerusalem for these feast days.

Acts 2:5

And there were dwelling at Jerusalem Jews, devout men, out of every nation under heaven.

Why were Jews from every nation staying in Jerusalem on the day of Pentecost?

They were staying in Jerusalem because Pentecost was a religious feast day. Devout Jews from every nation under heaven traveled to Jerusalem to keep the feast days, some coming hundreds or thousands of miles. They gathered for that feast-day observance rather than ordinary residence.