This will depend on your connectivity to our servers, and the latency between our servers and the servers of the application you are using.
It varies from game to game. For World of Warcraft, it can vary from between 60 ms to 300 ms. Most users get from 100 to 180ms in-game. Users from Europe, using US servers may experience pings from 200 to 300ms because of the extra distance the data has to travel (Europe to USA).