Is there a time limit for Canadian permanent residents and China citizens to return to China?

To retain the right of residence in Canada, you must live for 2 years in any 5 years. As long as you have stayed in China for two years in any five years, you can stay as long as the deadline is not exceeded. If it is exceeded, the permanent resident status will be invalid. There is no regulation on the number of times to go, mainly whether the stay time is enough. If you are not naturalized, you can renew your Maple Leaf Card after it expires. After the renewal, it is also arbitrary for five years to stay for two years.