Well, the duration of the Manchu occupation was longer than any prior to it. The Manchu peoples adopted and absorbed the Chinese culture, but the Han-Chinese viewed them as a foreign occupation. Conversely, the Manchus took great pains to make certain to not "polute" the Manchu blood with by letting themselves intermarry with the Han-Chinese. So the Qing Dynasty sees the greatest geographical control ever seen by a Chinese Dynasty other than the Yuan. They were not accepted as Chinese by the Han-Chinese anymore than the Yuan Dynasty, but somehow or another, they got things right where the Yuan got it wrong. They masterfully inserted themselves into Chinese society and culture. They overtook and subdued lands that no previous dynasty had ever managed.
The Han-Chinese outlook began as "this too shall pass", thinking that the Manchu domination would die in time like the Yuan had. Gradually, over the hundreds of years of Manchu dominance, the Han gradually came to accept that the Qing weren't going away anytime soon. No Flying Frog, if the Manchu and the Han were so melded together, why did the Manchu prohibition of Manchu/Han intermarriage continue to be enforced? The Han-Chinese ultimately gave up on there ever being an end to the Manchus domination. Much like India and the Aryan dominance, time blended the two into a single civilization in spite of the heavy-handed enforcement of separation. The Manchu ended up becoming an enforced aristocracy based on ethnicity, but the blending and melding of the two cultures was otherwise completed in the course of many centuries.
The domination of the Manchu carried on to the end of the Qing Dynasty, and continued thereafter. Today, you have two dialects: Cantonese (the language of the Han-Chinese) and Mandarine. Those speaking Cantonese are required to learn Mandarin or they are unable to function in society. Correct me if I'm wrong, but those speaking Mandarin as their first language are not requried to learn Cantonese, are they? Its pointless to call them Han and Manchu because they are no longer kept under enforced prohibition of intermixture. Its also pointless because the rest of the world hasn't a clue about Chinese history, wouldn't you agree? The ROC and thereafter PRC has managed to turn China into a more complete melting pot of cultures. Still, there is a general acknowledgement of there being a distiction between the two, much like the North and South in the United States today.