The processing time for a refund through US Auto Parts typically varies depending on several factors. Generally, once a return is initiated and the returned item is received at their facility, it can take approximately five to seven business days for the return to be processed. After the return is processed, the refund may take an additional three to five business days to reflect in the original payment method, depending on the bank or financial institution involved. Some customers may experience variations in timing based on these individual bank processes. It is always a good idea to review the specific return policy and refund information provided on their website, as this can give more detailed insights into the procedure and any potential delays that might occur.