The end-of-year sale used to be a day, opening in the dark with a queue outside. It now occupies the better part of two months, and the change came from logistics rather than from marketing preference.
Online orders cannot be fulfilled in a single day
A physical store can serve an enormous crowd in a morning because customers do the picking, packing and transport themselves.
An e-commerce operation has to pick, pack and ship every order individually, and its capacity is fixed by the number of stations and staff in the building.
Concentrating a season's orders into twenty-four hours would exceed that capacity by an order of magnitude, so demand is deliberately spread across weeks.
Carrier capacity is the harder constraint
Parcel networks have finite sorting and delivery capacity, and they set peak surcharges and volume caps well in advance of the season.
A retailer that generates more parcels than its allocation faces higher costs and slower delivery, which produces late arrivals and refund requests.
Extending the sale flattens the parcel curve, which keeps the retailer inside its committed volumes and protects the delivery promise.
Inventory risk pushes promotions earlier
Holiday stock is bought months ahead and paid for before it sells. Every week it sits unsold is a week of financing cost and a week closer to markdown.
Starting promotions in early November lets a retailer read demand while there is still time to reorder fast-moving lines or reallocate stock between regions.
A single-day event gives no such visibility, because by the time the results are known the season is effectively over.
The scarcity that made the day work has gone
Doorbusters depended on limited quantities and the belief that the price would not return. Online, prices are visible continuously and comparison is instant.
Shoppers who learned that a similar price appears the following week stopped treating the single day as decisive.
Retailers responded by making the period itself the event, with rolling offers rather than one moment that has to be attended.
What the long season costs the shopper
A longer window makes it harder to know whether a price is genuinely low, because there is no single reference point to compare against.
Prices within the period move, sometimes upward, and an early promotion is not reliably the best one on a given item.
The practical shift is from being present at the right hour to tracking a price over several weeks, which is a different skill and a slower one.