about patch 45

in patch 45's readme

1. To enable fix for bug 13503598 the value of "_external_scn_rejection_delta_threshold_minutes" should be set in init.ora through the following event:

   event="10344 trace name context forever, level <minutes>"

   or run the following to update the spfile

    > alter system set event="10344 trace name context forever, level <minutes>" scope=spfile sid='*';
   

   Please note, the above syntax assumes there are no other events set.

how to set <minutes>