Not very long i guess based on the comments from Sundar/VP of communications at Google's comments. They say they have a great plan for user acquisition.
This is a new ground up video app and so the performance is better compared to other apps(I tested it, its definitely better than hangouts/messenger/skype, but probably same as facetime quality).
Haha! I understand the comment, but what i want to infer with that statement is that they are very serious about this app and not like other apps(Inbox/G-board/Spaces) which they launched and tested. Allo & Duo has been launched in the I/O and you can figure the importance from it.
This is a new ground up video app and so the performance is better compared to other apps(I tested it, its definitely better than hangouts/messenger/skype, but probably same as facetime quality).