The clock will start ticking for the carrier calculated shipping when the tracking number is entered in the system. It is all up to you, the seller, to have a negotiated agreement with your supplier about how long they will take to process your order and ship product. You then inform your customers with a statement in your ad copy like, “Usually ships next business day” , or “Usually ships in three business days”. You then also let the customer know how long the average transit time is based on the shipping carrier you use. Of course, this all goes out the window if you use an international drop shipper, but you are still ultimately responsible for everything you say in your ad or sell on your website.
You are the seller of the products you advertise. There is never a situation where you don’t have control of your shipping if you have done your job of picking your suppliers wisely. That is your responsibility and your job. It is a simple matter to understand. If you don’t have control of your shipping, you have not done your job right. You communicate with your supplier, you should have a reasonable expectation that your supplier will keep you informed about inventory levels and pricing.
You, as the seller, are responsible for shipping delays if your supplier runs out of inventory. You must tell the customer the expected backorder shipping date, and if that date changes, update the customer ASAP.
Here is a paragraph from the FTC Federal Trade Commission website, called the 30-day rule.
“The Rule requires that when you advertise merchandise, you must have a reasonable basis for stating or implying that you can ship within a certain time. If you make no shipment statement, you must have a reasonable basis for believing that you can ship within 30 days. That is why direct marketers sometimes call this the “30-day Rule.”
If, after taking the customer’s order, you learn that you cannot ship within the time you stated or within 30 days, you must seek the customer’s consent to the delayed shipment. If you cannot obtain the customer’s consent to the delay — either because it is not a situation in which you are permitted to treat the customer’s silence as consent and the customer has not expressly consented to the delay, or because the customer has expressly refused to consent — you must, without being asked, promptly refund all the money the customer paid you for the unshipped merchandise.”
Full address to the FTC website is
Business Guide to the FTC’s Mail, Internet, or Telephone Order Merchandise Rule
If you are selling on Amazon or eBay or similar platforms, shipping delays and backorders translate to customer dissatisfaction and complaints. These translate to poor reviews and complaints which could get you banned as a seller. Once you get banned, it is really difficult to get reinstated.