You could say China was a barbarian country in the Mongol period, but the period only exist completely 30 years. Yuan (Mongol) dynasty existed 90 years, the first 30 years, it's all conquer war, the last 30 years, it's all liberal revolution.
In Spain, the Muslim conquered at least half the Spain for 700 years....you know, 700 year is about 30 generation.
lol, time is not in the consideration, back in 8th century, it was a joint Visigoth-Muslim force that conquer Spain, which means that it was a sectarian conquest, but not a Muslim conquest, the situation of Spain back then is much like the formation of turkey today, we won't call Turkey a Muslim country today (even tho they made up 97.8% of population)
The truly Muslim conquest of Spain lasted until al-andalus break up in 788 AD then sectarianism is formed, from the beginning of conquest at 711, the Muslim conquest lasted for 77 years, then it is break down into different sectarian rules
the 700 years "conquest" count to the last Muslim bastion in Iberian Peninsula , which is the Emirate of Granada, which have occupation approximately 1/6 of the original Al-Andalus caliphate (The Muslim conquest), mush of the land was re-conquest by Spain since year 788
Compare the map of Al-Andalus to Granada
Maps for Al-Andalus as of 788 AD
Caliphate of Córdoba 1000AD
taifa (independent muslim kingdom in 1080)
Maps of Emirate of Granada (1292-1462)