[kxng]

Yeah the KMS tools are the best for this, I used the online activation option in the tool and now I don't need to activate Windows 10 Pro ever since the license is linked to my Microsoft account LOL.
https://github.com/abbodi1406/KMS_VL_ALL_AIO
Good aswell:
https://github.com/massgravel/Microsoft-...on-Scripts

I've heard that the KMS activation expires after X days. Is it true?

Depends on the activation method, HWID activation is the method that is permanent (and is linked to the Microsoft account), the online method lasts 180 days, and the kms38 method lasts until the year 2038.

Info for online activation (ONLINE METHOD, LASTS 180 DAYS): https://massgrave.dev/readme-online-kms.html
Info for offline activation (HWID METHOD, PERMANENT): https://massgrave.dev/readme-hwid.html
Info for offline activation (KMS38 METHOD, LASTS UNTIL THE YEAR 2038): https://massgrave.dev/readme-kms38.html

For methods that aren't permanent, they can be renewed automatically by enabling an option in the script.

Thanks for the info.