MQ Adapter6.0: retry interval

Hi all,
I specify 2 or more to ‘Backout Threshold’ field on ‘Put Service’ Tab of my put service. Therefore re-trial is performed when the service fails to sent a message to queue.
As long as i check server log, re-trial is immediately performed after failure.
Can’t user set interval which re-trial is performed?

I use
webMethods Integration Server 6.0.1 SP2
webMethods MQ Adapter 6.0
on Windows 2000 Server.

Any information would be greatly appreciated.