For comparison's sake ...

[BlueMTexpat]

The Roman Empire 27  BC  – 395  AD
395 AD – 480 AD (Western)
395 AD – 1453 AD (Eastern)
1204 AD - 1461 AD (Trebizond)

https://en.wikipedia.org/wiki/Roman_Empire

The Persian Empire (actually different empires/eras - some with overlaps)
Achaemenid Empire 550 BC–330 BC
Seleucid Empire 312 BC–63 BC
Parthian Empire 247 BC–224 AD
Sasanian Empire 224 AD–651 AD

It is important to note that while many of these empires referred to themselves as Persian, they were often ethnically ruled by Medes, Babylonians, or Parthians. Persian dynastic history was interrupted by the Arab Muslim conquest of Persia in 651 AD, establishing the even larger Islamic Caliphate, and later by the Mongol invasion.

The main religion of ancient Persia was the native Zoroastrianism, but after the seventh century, it was replaced by Islam.

https://en.wikipedia.org/wiki/Persian_Empire

The Spanish Empire 1492 AD–1975 AD

It reached the peak of its military, political and economic power under the Spanish Habsburgs, through most of the 16th and 17th centuries, and its greatest territorial extent under the House of Bourbon in the 18th century, when it was the largest empire in the world. The Spanish Empire became the foremost global power of its time and was the first to be called the empire on which the sun never sets.

https://en.wikipedia.org/wiki/Spanish_Empire

The American Empire earliest date = 1776 AD-2017?

We have a LONG way to go even to be considered in the same group. But we've tried hard. https://en.wikipedia.org/wiki/American_imperialism

A couple others to consider:

The Egyptian Empire - especially long and complex, beginning circa 3100 BC

https://en.wikipedia.org/wiki/Ancient_Egypt

The Chinese Empire 221 BC-1912 AD

https://en.wikipedia.org/wiki/Emperor_of_China

The Caliphate 632 AD-1925

https://en.wikipedia.org/wiki/Caliphate

The Mongol Empire 1206 AD–1368 AD
The shortest time span but one of the largest in terms of expansion

https://en.wikipedia.org/wiki/Mongol_Empire

For fun: The Mongols - from John Green's Crash Course video

The Mughal Empire 1526–1540
1555–1857

https://en.wikipedia.org/wiki/Mughal_Empire

The Ottoman Empire 1299–1922/1923

https://en.wikipedia.org/wiki/Ottoman_Empire

The Portuguese Empire 1415 AD-2002 AD

https://en.wikipedia.org/wiki/Portuguese_Empire

The British Empire

The British Empire comprised the dominions, colonies, protectorates, mandates and other territories ruled or administered by the United Kingdom and its predecessor states. It originated with the overseas possessions and trading posts established by England between the late 16th and early 18th centuries. At its height, it was the largest empire in history and, for over a century, was the foremost global power. By 1913, the British Empire held sway over 412 million people, 23% of the world population at the time, and by 1920, it covered 35,500,000 km2 (13,700,000 sq mi), 24% of the Earth's total land area. As a result, its political, legal, linguistic and cultural legacy is widespread. At the peak of its power, the phrase "the empire on which the sun never sets" was often used to describe the British Empire, because its expanse around the globe meant that the sun was always shining on at least one of its territories.

https://en.wikipedia.org/wiki/British_Empire

The French Empire 1534 AD–1980 AD

The French colonial empire constituted the overseas colonies, protectorates and mandate territories that came under French rule from the 16th century onward. A distinction is generally made between the "first colonial empire", that existed until 1814, by which time most of it had been lost, and the "second colonial empire", which began with the conquest of Algiers in 1830. The second empire came to an end after the loss of bitter wars in Vietnam (1955) and Algeria (1962), and peaceful decolonization elsewhere after 1960.

https://en.wikipedia.org/wiki/French_colonial_empire