The Transfer Review Limit for how long varies depending on the financial institution and the type of transfer. Generally, banks in the United States may hold a transfer for review for up to 24 hours. This period is in accordance with the Electronic Funds Transfer Act (EFTA), which requires financial institutions to investigate and resolve any issues related to electronic fund transfers within a reasonable time frame. According to the Consumer Financial Protection Bureau (CFPB), the review period can extend to 10 business days in certain cases, such as when there is a discrepancy between the amount of the transfer and the available funds in the account.

The reason for this review period is to ensure the security and accuracy of the transaction. Financial institutions must verify the legitimacy of the transfer and check for any potential fraudulent activities. This process includes verifying the account holder's identity, confirming the availability of funds, and ensuring that the transfer complies with all applicable regulations. For instance, if a transfer is flagged for review due to suspicious activity, the institution may need additional time to investigate and prevent potential fraud.

Data from the CFPB indicates that the average review period for electronic fund transfers is around 24 hours. However, this can vary based on the complexity of the transaction and the institution's internal policies. In a study conducted by the CFPB, it was found that 86% of electronic fund transfers were processed within 24 hours, while 14% took longer due to various factors, including the need for additional verification or investigation.

In conclusion, the Transfer Review Limit for how long in the United States typically ranges from 24 to 10 business days, with the majority of transfers being processed within 24 hours. This review period is essential for ensuring the security and accuracy of electronic fund transfers, as well as for preventing fraudulent activities.