Windows 10: How many times can I use my Windows 11 Pro retail licence key?

how many times can I use my Windows 11 Pro retail key that I bought from Microsoft? Accidentally used it twice now on the same pc just now because I wasn't sure if its properly activated using "change product key". Will I need to buy a new license now if I replace this PC? Does a retail licence key have activation limits?

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Windows 10 Pro full retail licence

I have a PC running with a full Windows 10 Pro retail licence. I need to replace this PC (it is failing) with a new build and I understand I can use the same licence on the new PC if I uninstall the licence from my current PC. It is on a USB with a product
key.

I have two questions.

1. Can I use the MS Media Creation Tool 1909 to install Windows 10 Pro on my new PC and later enter my existing product key to activate Windows when I have fully loaded my programs onto my new PC or do I have to uninstall the licence key first.?
2. If I uninstall the licence key first from my old PC will it still be useable for a few days/week until I have fully loaded my new PC?
   

 

CHANGE WINDOWS 11 HOME DIGITAL KEY With a Windows 10 pro retail key

It's quite possible the Windows Pro licence is still registered against the old PC which you should have removed while you still had it.

If you had tried to transfer the licence before you got rid of it then it should have transferred. If you install Windows 11 Pro without a key and run the Activation troubleshooter do you see your previous computer listed?