Which of the stages of the Portuguese overseas discoveries turned out to be the longest: from the beginning of voyages to Africa

Which of the stages of the Portuguese overseas discoveries turned out to be the longest: from the beginning of voyages to Africa – to the discovery of the Cape of Good Hope, from reaching this cape – to the beginning of the invasion of India or from the development of India – to reaching the shores of China?

The development of the western coast of Africa lasted 70 years, since at the same time there was an improvement of ships – caravels and seaworthy crafts (cartography, using compasses). (It took 10 years to get from the Cape of Good Hope to India with the help of Arab pilots. From India to China — 20 years. These years were occupied by the wars between the Portuguese and the Muslim rulers of the Indian Ocean islands.