Backup Exec 12, auto abort settings

[Some1elsE]

im sure im jsut missing somethnig but i cant find the damn setting i want.
 running backup exec 12.0, on a server 2k3 standard box.
 just want to set backup exec to auto abort a backup if it runs longer than 12 hours,
there was no tape in the drive the other night, didnt notice till it said the job had been running for 38 hours and hadnt sent out an error message yet.

[br_nar]

I don't have the BEX console in front of me right now, and therefore can't lookup the exact terminology.
However, I know it's a property of the 'selection list'.
I think it's called something like 'Automatic cancellation...'