Black Friday is technically just one day—the Friday after Thanksgiving—but modern “Black Friday” sales usually stretch from at least a long weekend to an entire week or more, depending on the retailer.

What “official” Black Friday means

  • Traditionally, Black Friday is the single shopping day right after Thanksgiving in the U.S., running roughly from midnight to 11:59 p.m. on that Friday.
  • In recent years, many guides still treat “Black Friday” as that calendar Friday, even while acknowledging deals before and after it.

How long deals really last now

  • Many major stores now run Black Friday week or Black Friday weekend events, with offers starting days (or even weeks) before the actual Friday and running through the weekend.
  • It is common for discounts to run from around the week of Thanksgiving through Cyber Monday, effectively turning Black Friday into a 4–12 day sale period depending on the brand.

Examples from recent years

  • Some big retailers schedule Black Friday deals from roughly Nov. 20 until the Monday after Thanksgiving, branding the whole period as “Black Friday Week” or part of “Cyber Week.”
  • Other chains focus on a core window like Nov. 23–29 or Friday–Sunday, but still sprinkle early “Black Friday” promos earlier in November.

What this means for you

  • If you care about the true “Black Friday” date, it’s one day: that specific Friday after Thanksgiving.
  • If you care about “how long is Black Friday” in practice for shopping, expect the real deal window to run at least from Black Friday through Cyber Monday, with many “Black Friday” prices starting earlier in the week and sometimes continuing into a broader Cyber Week.

TL;DR:

  • Calendar Black Friday: 1 day (the Friday after Thanksgiving).
  • Modern Black Friday sales: often 4–12 days, usually spanning from early in Thanksgiving week through Cyber Monday as part of “Black Friday Week” or “Cyber Week.”

Information gathered from public forums or data available on the internet and portrayed here.