No more than four times. When banks inquire about the credit information of mortgage loans, there are too many inquiries, and they cannot apply for mortgage loans within two months, so the number of credit inquiries within two months should not exceed four. Credit investigation is an activity of collecting, sorting, saving and processing the credit information of natural persons, legal persons and other organizations according to law, providing credit reports, credit evaluation, credit information consultation and other services to help customers judge and control credit risks and conduct credit management.