Sony will soon have the record for most consecutive and total amount of Updates for a console in a single month and more than likely in a year.
I kid, I Kid! But seriously when will it end? So tomorrow expect several features to go offline during then. The regular maintenance is expected to run from 8AM-5PM Pacific (11AM-8PM EST; 8AM-5PM PST) and will prevent access to the PSN Store, Home, Account Management and the usual.
And of course users “may encounter difficulty while signing in to PSN.”
You can follow them on twitter to find out when things will be back up.