Exchange 2013 - Database Availability Group (DAG)

Hello,

I have our exchange configured as part of a database availability group (DAG) between a local and remote location.

While updating our local firewall, the database automatically moved to the remote location. However the network was down for about 20 seconds only.

Does anyone know when I can change the value of how long the system should wait before initiating an exchange database failover? Right now the parameter is set to  a very small timeout and needs to be increase by about 30 seconds.

Any information / guidance would be greatly appreciated.