Does a double optin confirm link expire?

Does a double optin confirm link expire?

I just tried to test changing the "subscribed" status of prior tested registrations (that used my own email address) for which I had not complete registrations by confirming the double optin. I found that I get a link expired message (see below). Is this the normal behavior? If so, for how long is an optin link valid before it expires?
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Problem in confirmation!

Sorry, You have clicked an expired link. Please regenerate a new link.