"It Depends".

One of the challenges is that separate instances of PingPlotter are unsynchronized, so there might be multiple instances sending out packets at the same exact moment. This might happen with as few as two instances (although that would be unlikely on any broadband connection because two instances can be simultaneously handled by a modem in most cases, if you keep that packet size small).

We have done 10 without problem on a 640K connection, but as you increase the number of packets being sent out, you increase the odds of overlap.

We are addressing this concern in a future product release (of our upcoming "Pro" line).

- Pete