shows the top 10 longest-active user sessions

/* top10active.sql
    shows the top 10 longest-active user sessions
*/
col osuser format a10 trunc
col LastCallET     format 99,999
col sid format 9999
col username format a10 trunc
col uprogram format a25 trunc
col machine format a10 trunc
set linesize 132
set verify off
accept trgtuser char default ALL prompt 'Limit to what userid <ALL> : '
select * from (
select to_char(s.logon_time, 'mm/dd hh:mi:ssAM') loggedon,
  s.sid, s.status,
  floor(last_call_et/60) "LastCallET",
 s.username, s.osuser,
 p.spid, s.module || ' - ' || s.program uprogram,
s.machine, s.sql_hash_value
from v$session s, v$process p
where p.addr = s.paddr
  and s.type = 'USER'
  and s.username is not null
  and s.status = 'ACTIVE'
  and (s.username = upper('&trgtuser') or upper('&trgtuser') = 'ALL')
order by 4 desc)
where rownum < 20;