It's definitely very bursty. On weekends and holidays things are much more quiet. During peak load we'll be in the hundreds/sec. Also keep in mind that chat mes

It's definitely very bursty. On weekends and holidays things are much more quiet. During peak load we'll be in the hundreds/sec. Also keep in mind that chat messages don't actually make up the majority of the traffic we serve; it's presence information (away, idle, available), people connecting/disconnecting, etc. (I'm one of the HipChat co-founders.)