As part of that announcement, the Redmond company also confirmed that the next Long-Term Servicing Channel (LTSC) version will be based on Windows 10 21H2 and will be released later this year.
Mainstream end of support for Windows 10 21H2 LTSC is 2027-01-12. But the process to switch is not particularly easy nor is it free. You need a Windows 10 LTSC license.
You may have heard about a special edition of Windows 10 that will remain supported beyond October 2025. That edition is known as LTSC (Long-Term Servicing Channel) and will be supported until 2029.