0 - "Thank you for registering, please click here to validate your email address."
24 - "You haven't yet validated your email address for our forums, please click here. Your request to join our community will expire in 48 hours if you do not validate your account."
48 - same as above only indicating 24 hours.
96 - "Your request to join our community has expired due to non-validation of your account; to re-sign up, please visit here."

Or something similar :X

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