Hello, it may happen the email with the activation code comes later than one hour to the mailbox. My provider uses greylisting antispam, and the email sent at 11:41 from your system, got to my maibox at 12:42. Just one minute later. How unlucky.

Then, I cannot keep my face in front of the PC 24/7, and I saw the email at about 13:00, just looking every now and then, at the email that never comes.

Then, I discover I cannot request another email until 24 hours passes.

Please makes expiry time a little longer, or resend time more shorter.