The handling time is the number of business days the seller will take to send the item after receiving your cleared payment. A payment is considered "cleared" after the money from the buyer has been deposited into the seller's account. If you pay by credit or debit card, Apple Pay, Google Pay, Afterpay or PayPal, the payment may clear immediately.
This does not include the number of business days the postage service will take to deliver the item to you.
Based on a seller's specified handling time and postage service, eBay will provide buyers with an estimated delivery date. By knowing the estimated delivery date, you can determine how long it will take to receive the item. 'Business days' are normal weekdays. Saturdays, Sundays, and major holidays do not count as business days, so you'll want to keep them in mind as you determine the earliest delivery date for you.
If you want to receive the item quickly, complete your payment to the seller as soon as possible.