"Tax refund 10 working days" usually refers to the processing time of tax refund application. Specifically, when you buy goods in the applicable countries or regions, you can apply for a refund of the consumption tax paid. And "retention" means to temporarily deposit the refunded consumption tax amount in the tax department, so that you can use or deduct the amount in future shopping. "Tax refund for tax retention 10 working days" means that it usually takes about 10 working days from the time you submit your application for tax refund for tax retention to the time you get the tax refund amount. This time may vary depending on the region and the specific tax refund policy, so it is best to consult the relevant local tax refund regulations or consult relevant institutions to obtain accurate information before the specific operation.