I don't think this is possible, but perhaps you could try a countdown that says "Activate in the next 24 hours" and they can look at the time it was sent to see how much time they have left, or perhaps say "You have until 00:00 to activate your account," but that's more complicated. Most activation emails start the 24 hours from when it was sent, not recieved, and they are usually activated immediately, so I wouldn't worry about making it complex with countdowns.
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