John: "I'm going to the shop to buy some milk. I'll be back in a while."
Johns Imaginary Friend : "Ok. See you in a while" 

"I'm going travelling for 3 months so I won't be around for a while"

Hello Penn. I'm back again! I have finished my work, so I now have time to explain 'in a while.'

In fact, I don't think I'll EXPLAIN. I'll give some examples that are true for me this very afternoon! (this very afternoon ... means... this particular afternoon/today/now. It's an unusual use of 'very.')

I want a cup of coffee, but I am typing now. Obviously! I'll make that cup of coffee IN A WHILE.

It's now 1.45pm and at 2pm I have a student online from Moscow....  so in a very short while (2 minutes?) I must prepare for the lesson!

I hope this helps! Come on other teachers and students! Let's have some more examples of what we're going to do... in a while!

MW.

Hello Penn, I am busy right at this moment but I hope I can explain 'in a while' ... in a while.

Or have I just explained it!

?

this sentense is wrong?

but how to understand"we haven't seen you on fb in a while"?