SLA Breach calculation

SLA Breach calculation

Dear All,
 
Greetings!
 
Can anyone help me with my below query on SLA breach.
 
I just want a query to find out the amount of time a ticket has remained "open" after it has breached the SLA. The report should exclude the time the ticket has been under "onhold" status even after breach.
 
Regards,
Rama.