Ten years.
It took him ten years to conquer the Persian Empire and turn it into an empire of his own.
Ten years
From 334 to 327 BCE.
Pizarro took one year to conquer the Incan Empire.
All of them, so he could take over all of the Persian Empire.
He followed his assassinated father Philip's plan to take over the Persian Empire.
three months
Ten years.
A decade.
Macedonia, which his father Philip expanded to take over the Greek city-states and planned to conquer the Persian Empire.
it took alexander twenty-two years to win control of his big empire
Caesar set out to be greater than Alexander. While Alexander had taken over the Persian Empire in Asia, his early death terminated his plan to conquer western Europe. Caesar began by cementing Roman control of western Europe and planned to take Alexander's ex-empire in Asia. He was assassinated on the eve of his departure on this campaign. So both had their ambitions frustrated by their early deaths.