Bios update can take a while, especially if it is your first time updating the bios. The amount of time it takes will depend on the bios version you are updating to, your computer’s make and model, and the specific instructions for your computer. Generally, it should not take more than 30 minutes, but it could take up to two hours. Make sure your computer is plugged in and that you have backed up your data before beginning the bios update.