A business day is a duration of time standardized to the seven-day work week, used to differentiate calendar days, based on a seven-day week, from the time period when a company is in operation.

In the Western world, Saturdays and Sundays are not counted as business/working days. In some Muslim countries and in Israel, this applies to Friday and Saturday.

Business days are common measurements in companies with time-sensitive services, such as shipping or payment processing. As an example, when sending a package with a shipping company such as FedEx, a shipment dispatched on a Thursday that is to be delivered in "two business days" will arrive on the following Monday.

In the United States of America, a work day is generally referred to as a weekday, not including Saturday and Sunday.

-Wikipedia
I ordered these new Molotow markers from artprimo.com on Thursday, it said they'd arrive in 2-5 business days so I guess they'll arrive on Monday-Thursday.
by GEARZ May 23, 2008
Get the business day mug.
The amount of time it takes for a male to respond to a female's text message. In contrast to the Webster definition, this business day could be up to 7 days at a time. Business Days usually cause the female population stress and result in radical actions.
Hazel: "Have you heard back from Adam yet?"

Mary:" No, I am up to 5 business days now."
by PudgyChris September 30, 2018
Get the Business Day mug.
Commonly used phrase in Hypixel and Hypixel-related communities to represent something having an undetermined amount of time, that's likely to almost never happen or take a very long time.

It is said to have originated from the "Wizard Tower" of Hypixel SkyBlock where the NPC there has been replying with the dialogue: "Hmm...something appears to be broken. Give me 3-5 business days to fix!" for the past ~2.5 years and counting.
Friend: "When is x coming out?"
Me: "3-5 Business Days"
by Melancholy Cloud September 2, 2021
Get the 3-5 Business Days mug.
The amount of days every online retailer tells you to wait. It turns out one business day is about four regular days. Who would've thunk it?
Randy: "How come my order is still processing?"
Company: "Wait 1-2 business days."
*Shipped 8 days later*
by tastyresort July 17, 2019
Get the 1-2 business days mug.
industrial usage of leisure time, doing nothing with vigor!
extreme laziness!!

doing nothing that will improve ones' lot in any way, financially or strategically.
usually, i would have to rush off to "prepare for battle" (get ready for work) -now i'm going to have a busy day doing nothing!!
by michael foolsley May 7, 2011
Get the busy day doing nothing mug.