Delay in email delivery

Why does it take an email 5 + hours to deliver? Email sent from ira@charityworks.net on 10/22 at 1:40 pm to lklein9@comcast.net. Received at 7:11 pm. What causes this? This is not happening from other than a HOMESTEAD based email. Other times emails from ira@charityworks.net to lklein9@comcast.net take the 'normal' less than 3 minutes (if that).