Kik users: How many days does one have to not open their kik app before you see the "oops..." message?

Last Monday, I messaged a friend 3 days after he last messaged me and my message was stuck on S (and is still stuck on S till today).

I messaged him yesterday and not only is my message stuck on S, but I also got this response from the kik server: "Oops it looks like (friend's name) phone has been off/disconnected for a while. We'll deliver your message when they connect again".

Based on your own experience with the app, any idea what this means? I've checked online and a lot of people say that it means their phone is off or in a dead zone, or that they haven't checked/opened the app for a few days. Any idea on how many days before the Kik server sends that message? Some also say that it means they've logged out of kik, although I don't see how you can "log out" of kik cos there's no option for that.

Any ideas or input welcome!
Kik users: How many days does one have to not open their kik app before you see the "oops..." message?
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