Alerts question

I’ve written an alert that will fire if there haven’t been any messages received by a thread in X minutes…  

IE:  I’m doing this:

   { NAME {David Charge Test} }

   { VALUE lastr }

   { SOURCE CHG_F_IMPAC_G2 }

   { MODE delta }

   { WITH -2 }

   { COMP {> 4500} }

   { FOR {nmin 5} }

   { WINDOW {* 37 15 * * 1-5} }

   { ACTION {

       { exec /hci/scripts/test/alerts/IMPACGerrorMsg }

But this alert will never fire if I set the duration to X minuts. But If I set Duration to “Once” like the following, it works fine.

{ALERT

   { NAME {David Charge Test} }

   { VALUE lastr }

   { SOURCE CHG_F_IMPAC_G2 }

   { MODE delta }

   { WITH -2 }

   { COMP {> 4500} }

   { FOR once }

   { WINDOW {* 37 15 * * 1-5} }

   { ACTION {

       { exec /hci/scripts/test/alerts/IMPACGerrorMsg }

Any suggestions?

Thanks!