Here's the Ebay message, and note that at least right now, it applies to sellers who consistently ship sooner than their shipping defaults state:
" We’re updating the pre-filled handling time value in the listing flow to 1 day for sellers who consistently ship faster than current defaults. In September 2019, eBay will update the pre-filled value in the Handling time field in the eBay listing flows to 1 day. Currently, eBay listing flows are pre-filled with 2 or 3 days. The 1 day handling time change will be an optional default when you create new listings. You can still select the handling time that works best for you at any time, and we will not change handling times in your existing listings.
We recommend you show a handling time of 1 day or less in your listings as delivery speed is an increasingly important factor in buyers’ purchase decisions, and because you are already shipping most of your shipments in 1 day or less. By reducing your handling time, your listings will be more appealing to buyers looking for a faster delivery.
To allow an opportunity to adjust to a 1 day handling time, we will protect your account from late shipments that are a result of the update. Through January 1, 2020 we will remove defects for a late shipment that are a result of the update. These protections will apply to transactions for listings on eBay.com where a 1 day handling time is stated. Defects will be automatically removed within 1-2 weeks of being received.
Learn more about handling time best practices.
Thank you for selling on eBay.
The eBay Selling Team "
