WWE announced today that they will have a 2 hour pre show before WrestleMania. The first hour will air on WWE.com, the WWE App, YouTube, Facebook, Twitter, Google+, and Pheed at 5pm eastern. The second hour will air on the WWE Network at 6pm eastern.
WrestleMania 30 airs at 7pm eastern and that will be followed by the post-show on the WWE Network. So there will be about 7 hours of live WWE programming on WrestleMania Sunday.