you can configure a time range in cli from mm in /md context:
[md] (config) #time-range periodic test
[md] (config-submode)#weekday 09:00 to 17:30
(mc1) #show time-range
Time-Range test, Periodic
-------------------------
StartDay Start-time EndDay End-time Applied
-------- ---------- ------ -------- -------
weekday 09:00 17:30 Yes
Now you can use the time range in your policy, here you can also create a time0range object, but gui not always works as good as the cli for this type of object.