Using the modify command „F ESYxxx,SHUTDOWN=NOM” to shutdown the NOM monitor, the NOM monitor is working until there is "nothing" left to do.
So it is not possible to get the NOM monitor down in a predictable time.
The only possibility is to shutdown the whole ESY task with setting the parameter SHUTDOWN-MAX-DELAY to a desired value.
Perhaps it is possible to get an extension of the modify command to set a time value.
So that the ESY task would remain activ.
Of course this should only be consired if the implementation is not too complex.