The general rule of thumb is that one is supposed to arrive. 1  2 hours early for a domestic flight and. 2  3 for an international flight.
It was initially proposed in a Kickstarter campaign, during which Oculus VR (at the time an independent company) raised US$2.5 million for the development of the product. The Rift will be released in the first quarter of 2016, making it one of the first consumer-targeted virtual reality headsets. Oculus has described it as the first really professional PC-based VR headset.
The Windows version of the game is also available for download separately through Valve's content delivery system, Steam, and was released as a standalone retail product on April 9, 2008. In addition to Portal, the Box also included Half-Life 2 and its two add-on episodes, as well as Team Fortress 2.