Confirmation emails are generally sent out instantly. If you haven't received one yet, please try the following:
1. Check your spam folder to make sure it didn't end up there by accident
2. Add hello [at] soundcloud [dot] com to your address book in your email settings. It may be that your email provider has bounced our email confirmation.
3. Try again to re-send the email confirmation from your account (this can be done through your Email Settings page).
4. If it still isn't working, check to see if there's a typo in your email in your Email Settings page.