The online (available) hours of each clearing system are as follows.
[SSO]
From Monday 4:30am to Saturday 6:00am (except holidays)
[Cash Products Clearing System]
Every business day from 8:00am to the next day 3:00am
[Derivatives Clearing System]
Every business day from 7:30am to the next day 5:40am
[JGB Clearing System]
Every business day from 7:00am to 9:00pm
[OTC Clearing/Collateral Management System]
Every business day from 5:00am to 12:00 midnight
(Web Portal Plus: Every business day from 7:00am to 8:00pm)