Answer
Yes — a single Oracle DBMS_SCHEDULER-style calendar expression can express multiple times and specific weekdays in one schedule, avoiding the need for separate task entries per time slot. For example, FREQ=DAILY; BYTIME=063000,120000,171500; BYDAY=MON,TUE,WED,THU,FRI runs the task at 06:30, 12:00, and 17:15 every weekday. This scales much better than creating one job per site/time-slot combination when you have several sites each needing the same multi-times-a-day pattern.