As an international B2C platform under Alibaba Group, AliExpress provides a platform for global sellers to sell products to global consumers. Regarding delivery time, AliExpress has clear regulations. Sellers need to complete delivery within the specified delivery period, otherwise it will affect the seller's order fulfillment rate and buyer satisfaction.

The following are some regulations and precautions about AliExpress delivery time:

1. **Delivery period**: Sellers need to complete delivery within the promised delivery time after the order is confirmed. The promised delivery time stipulated by AliExpress is different for products of different categories, generally 2-3 days, and no longer than 7 working days.

2. **Order status**: If the order status shows "Waiting for seller to ship" after the buyer places an order, the seller needs to click "Shipping" within the specified time and fill in the waybill number of the goods.

3. **Extend delivery time**: If the seller cannot ship within the promised time due to special circumstances, he can communicate with the buyer to extend the delivery time. If the buyer agrees, he can extend the delivery time on the order page. It should be noted that extended delivery time will affect the seller's credit score.

4. **Overseas warehouse delivery**: If the seller uses AliExpress's overseas warehouse service, the delivery time will vary depending on the location and settings of the overseas warehouse. When setting up products, sellers can choose to use a specific overseas warehouse delivery location so that buyers can see faster logistics options.

5. **Cancel order after delivery**: If the seller cancels an order before delivery, it is necessary to reach an agreement with the buyer. If the buyer has already paid, the seller needs to refund the money in a timely manner. If the seller cancels the order after delivery, it is necessary to fill in a detailed reason for cancellation and ensure that the buyer is informed.

6. **Penalty for overdue delivery**: If the seller fails to deliver the goods within the promised time, the order will automatically enter an extended time. Overdue delivery will affect the seller's order fulfillment rate and account health, and may be punished by AliExpress, such as limiting account functions, lowering search rankings, etc.

In order to maintain a good trading environment, sellers should strictly abide by AliExpress's delivery time regulations, ensure timely and accurate delivery, and provide high-quality logistics services to global buyers. At the same time, it is recommended that sellers clearly mark the product delivery time on the product page to increase buyers' purchasing confidence.