Why is there a myth about 183 days? Because the regulations are indeed written like this, and the principles of international acceptance are also like this. But in practice, it depends on whether you have a household registration. Realistically speaking, this is reasonable, because according to the past entry and exit rules, long-term overseas residence (even if you do not become a foreign national) does have to cancel your household registration, and the customs clearance will be directly canceled for you. It's just that the enforcement is not strict now. You have to prove that you don't have any tie with your home country, supposedly your house is going to be sold, your car is going to be sold (of course you can sell it to your brother-in-law, in practice), otherwise you can't prove that you are not likely to come back to live at any time.