How long is the activation mail valid?

Hi guys!

I got a question! I changed my email and i guest I became an activation email! And i didn't click the link and how long is this email valvid to get invalid? When it takes 24 hours to be invalid can I change it again to an other email adress? Also after 24 hours without activation does the old email active to this acc either?

Thx for the answers

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