Download the Windows Assessment and Deployment Kit (ADK) for Windows 10 to install tools and documentation for OEMs and ODMs to customize Windows 10 images, assess the quality and performance of systems or components, and to deploy Windows operating systems to new computers. The Windows ADK includes Windows Imaging and Configuration Designer (Windows ICD), the Windows Assessment Toolkit, the Windows Performance Toolkit, and several new and improved deployment tools that can help you automate a large-scale deployment of Windows 10.
The download starts off with a small exe that allows you to choose between two options.
The time this will take is determined by your internet connection and proximity to the download source, so it could be pretty quick, or it could be time to grab a coffee and make a sandwich.