Maybe this will help. As you can see there are a total of 14 GCD circles spinning every time I attempt a combo. I attempted this on a Level 56 Wisent in sea of clouds and with doing a standard setting of combo rotations, it took about 35 seconds to kill the mob and it took 13 total presses of the keys making the total rendered number GCD circles to be:

14 circles * 13 button presses = 182 total circles rendered in 35 seconds.

Thus, approximately in 1 minute killing 2 mobs of this level solo my eyes see 364 circles * 60 minutes = 21,840 spinning circles my eyes have to process.

So how many hours did your testers play? In theory if you accumulate conservatively 24 hours of game play killing mobs that take 30s to kill a WAR will see a total of:

364 * 60 * 24= 524,160 GCD spinning circles I will have to process going forward.

So 10 days of game play: 5,241,600 circles. The defense rests.