Passing Arguments through Impala Shell

The following line is a part of the script file.

(CASE WHEN(cast(now() as int)-cast(record_time as int) >= 60) THEN "R" ELSE "P" END)

I need to pass the value 60 as an argument, the value of 60 should be passed as parameter/argument from impala shell.

If we do that in shell script, it affects the performance, as it has to invoke a shell and quit the impala shell for every line of the script.

Thank you.

Warm regards,
Adharsh