Use this script to monitor how long the import into a table takes and how many rows have already been imported. Log in as sysdba to do that.
It shows how many rows are already imoprted dymamically. If you already know how many rows you have in the table it is very handy and you can see the progress of your import.
select substr(sql_text,instr(sql_text,'INTO "'),30)
table_name, rows_processed, round((sysdate- to_date(first_load_time,'yyyy-
mm-dd hh24:mi:ss'))*24*60,1) minutes,
trunc(rows_processed/ ((sysdate-to_date(first_load_time,'yyyy-mm-dd hh24:mi:ss'))*24*60)
) rows_per_minute from sys.v_$sqlarea where sql_text like 'INSERT %INTO "%'
and command_type = 2 and open_versions > 0