Check Materialize View Refresh Schedule
SELECT job, what mview_name,
TO_CHAR (last_date, 'mm/dd/yyyy hh24:mm:ss') last_execution,
TO_CHAR (next_date, 'mm/dd/yyyy hh24:mm:ss') next_execution, INTERVAL
FROM dba_jobs
WHERE what LIKE 'dbms_refresh.refresh%';