How long can I live in Hong Kong after immigrating to Hong Kong and how much does it cost?

You can apply for permanent residence in Hong Kong if you have lived in Hong Kong for seven consecutive years. If you live, alas, the house in Hong Kong is super expensive, and a parking space in Dawei City is 2.48 million Hong Kong dollars. You can imagine how expensive this house is. Actually, I don't understand what you mean by immigrating to Hong Kong. Do you have temporary id card? You can stay as long as you have a visa.