Google has been rolling Inbox invites out at a somewhat brisk pace, but if you find yourself still waiting, there's a surefire way to get one today. Just send an email to email@example.com between 3 and 4PM PT today and you'll have your invite by 5PM.
Want an invite TODAY? #InboxHappyHour 3-4pm PT. Send us an email at firstname.lastname@example.org between 3 and 4pm PT and you'll get your invite by 5pm
— Inbox by Gmail (@inboxbygmail) November 5, 2014