Disable BE2010 Post Job Command Timeout

Good afternoon-

Is there a way in BE2010 to do any of the following:

• Disable the post job command timeout?
• Increase the timeout to a value larger than 300 minutes?
• Configure the post job command in such a way that it doesn't wait for a response/return code?

My backup job calls a replication script that can sometimes take more than the maximum 300 minutes to complete. This causes my backup job to report a "failed" status, even though all of the server data is backed up successfully.