How to check RMAN backup elapsed times in Oracle

Elapsed hours per RMAN backup job, ordered by session key. Compact form of V$RMAN_BACKUP_JOB_DETAILS — good for spotting a backup that suddenly takes twice as long as usual.

COL status FORMAT a9
COL hrs    FORMAT 999.99

SELECT session_key,
       input_type,
       status,
       TO_CHAR(start_time, 'mm/dd/yy hh24:mi') AS start_time,
       TO_CHAR(end_time,   'mm/dd/yy hh24:mi') AS end_time,
       elapsed_seconds / 3600 AS hrs
FROM   v$rman_backup_job_details
ORDER BY session_key;