DBA_AUTOTASK_SCHEDULE displays the schedule of maintenance windows for the next 32 days for each client.

Column Datatype NULL Description
WINDOW_NAME VARCHAR2(30)   Name of the maintenance window
START_TIME TIMESTAMP(6) WITH TIME ZONE   Projected start time of the window
DURATION INTERVAL DAY(3) TO SECOND(0)   Currently defined duration of the window (NULL for the currently open window)