The handling time is the number of business days the seller will take to ship 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 the buyer pays by credit card or debit card, Apple Pay, Google Pay or PayPal, the payment may clear immediately. However, in categories where permitted, if the buyer pays by check, money order, or eCheck, it may take several days.
This does not include the number of business days the shipping service will take to deliver the item to you.
When a seller has specified a handling time and a certain shipping service with transit times, 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.