What about scalability? What can TTN handle and how?

Hi people,

I got a question about how many calls the TTN network can handle in one time.
What will happen when there will be send 10.000/50.000/100.000 messages in one time to the TTN servers?
Or when will the servers of the TTN fall down, is TTN resistant to so many calls in one time?

Are there some documents about this? or some topics where this is explained?