Sharepoint Farm backup with powershell timeout

Hello experts.

I have faced with the problem using powershell script to manage automatic full farm backups with file rotations.

I use common script taken from this page

http://gallery.technet.microsoft.com/office/9b99c435-8831-4c9e-a70b-1f13158ef22a

And every was fine until backup procedure of wss_content database grew up to 1 hour

I have MS RBS configured for wss_content database and files in BLOB store have about 100Gb in summary

Now i can't build full backup and have error in spbackup.log

[12/4/2012 12:59:21 AM] Progress: [WSS_Content_MP27] 80 percent complete.
[12/4/2012 1:02:03 AM] Warning: [WSS_Content_MP27] Time is out. Server did not respond within the timeout period.
The backup or restore was aborted.

After that script try to repeat failed command 3 times using next statement

SQL command timeout is set to 1.00 hours

Question is how i can increase timeout for this operation?

Because for our database 1 hour is dramatically low value.

One week ago full backup of wss_content database takes 50 minutes.

Thanks.

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ruslanin