Will last for one hour.
Sony will be conducting maintenance on the PlayStation Network this week. Maintenance will start at 3 PM local time and last for one hour on May 23rd. During this time, platforms like PlayStation 4, PlayStation 3, PlayStation Vita and web surfing will be affected.
You can still play games and use “most” programs during the maintenance period but will be unable to manage your account, access the PlayStation Store, PlayStation Music and PlayStation Video. “Gaming and social” functions will also be limited. Those with their PlayStation 4 activated as the primary console can play “most” games along with accessing various third party services.
With regards to the maintenance, Sony stated that, “We apologise for any inconvenience. We strive to ensure that PlayStation Network services are available at all times, but occasionally we must take PlayStation Network offline to perform essential maintenance and implement feature enhancements. We are working hard to reduce the duration of each maintenance.”