How Long Does a BIOS Update Take? What to Expect Before You Start

Updating your BIOS is one of those tasks that sounds straightforward but carries enough risk that most people want to know exactly what they're getting into before they begin. Time is part of that equation — but it's only one piece of a larger picture.

What Actually Happens During a BIOS Update

BIOS (Basic Input/Output System) — or its modern successor, UEFI (Unified Extensible Firmware Interface) — is the low-level firmware that initializes your hardware before your operating system loads. When you update it, you're rewriting code stored on a dedicated chip on your motherboard.

The process typically involves:

1. A flashing utility writing new firmware to the chip
2. A verification pass to confirm the write was successful
3. A system reset to boot into the new firmware

Because this happens at the hardware level — outside the operating system — your screen may go dark, your fans may spin up, and your system may restart one or more times without warning. That's normal.

Typical BIOS Update Duration

For most desktop and laptop systems, a BIOS update takes between 1 and 5 minutes from the moment flashing begins to when the system finishes rebooting. Some updates complete in under 60 seconds. Others, particularly on enterprise-grade hardware or systems with large firmware packages, can run closer to 10 minutes.

The clock starts when you confirm the flash — not when you launch the utility — and ends when your system fully boots back into your OS or BIOS setup screen.

⏱️ A general breakdown:

These are general ranges, not guarantees. Your hardware and firmware package determine actual timing.

Factors That Affect How Long It Takes

The Update Method You're Using

There are several ways to flash a BIOS, and the method matters:

• In-OS utilities (like Dell's BIOS update executable or ASUS's AI Suite) run from within Windows and tend to be fast, though they require a reboot to do the actual flashing.
• BIOS/UEFI built-in flashers (accessed by booting into your BIOS setup) are common and reliable. Speed varies by manufacturer.
• USB-based flashing (where you write the update file to a USB drive and trigger it from the BIOS) is similar in speed but adds setup time.
• Q-Flash, EZ Flash, M-Flash and other manufacturer-branded tools work within the UEFI interface and are generally efficient.
• Crisis recovery flashing (used when a BIOS is corrupted) can take longer and may require specific hardware steps.

The Size of the Firmware Package

Modern UEFI firmware files have grown larger than the BIOS files of a decade ago. A larger firmware file simply takes longer to write and verify. High-end motherboards with extensive feature sets tend to have bigger firmware packages.

The Age and Speed of Your Hardware

Older motherboards with slower flash memory chips will take longer than newer boards with faster storage. The chip being written to — not your SSD or RAM — is the bottleneck here.

How Many Versions You're Jumping

Some manufacturers allow you to apply a single update file regardless of your current version. Others require sequential updates — meaning if you're several versions behind, you may need to run the process multiple times. Each pass takes its own time.

Desktop vs. Laptop

Laptops often have additional checks built into the update process — verifying battery level, running pre-flash diagnostics — which can add time. Most laptop manufacturers require the battery to be above a certain charge threshold (commonly 10–25%) before flashing begins, and some utilities enforce this programmatically.

What to Never Do During a BIOS Update 🚨

Regardless of how long the process takes, the critical rule is this: do not interrupt a BIOS update in progress. That means:

• Don't shut down or restart manually
• Don't let a laptop run out of battery (keep it plugged in)
• Don't close the lid on a laptop
• Don't cut power to a desktop

A failed or interrupted BIOS flash can leave your system in an unbootable state. Some motherboards include a dual BIOS feature (a backup chip) or a recovery mechanism to handle this scenario — but not all do.

The Variables That Make Your Situation Different

How long a BIOS update takes for you specifically depends on factors that aren't visible from the outside: which motherboard manufacturer you're using, how their flashing utility behaves, how many versions behind your current firmware is, whether your laptop is plugged in, and whether your system has any built-in recovery mechanisms.

Two people doing a BIOS update on the same day might have meaningfully different experiences — one might be done in 90 seconds, another might spend 15 minutes working through multiple sequential updates on an older board that hasn't been touched in years.

The process itself is well-documented for most hardware. But how it unfolds — and whether now is the right time to do it — depends on the specific system in front of you.