how to send escalation e-mails every hour not every day?

[bulram]

When a ticket escalates there is, in my case, an e-mail send as a reminder. A reminder is also send every day until somebody solved the ticket.
What i want is to get a reminder every hour.
Generic Agend is running every minute calling the "NotifyAgentGroupOfCustomQueue.pm" script.

What i tried by now is to modifiy line 123 in the "NotifyAgentGroupOfCustomQueue.pm"
&& $Line->{CreateTime} =~ /$Year-$Month-$Day/ --- unmodified
&& $Line->{CreateTime} =~ /$Year-$Month-$Day-$Hour/ --- modified. That resulted in sending a reminder every minute.

Does anyone know how the NotifyAgentGroupOfCustomQueue.pm is to be modified to send the escalation reminder every hour?

Thank you for your help.