Does the number of processors affect the simulation speed?

Dear All,

I'm conducting EDEM simulations with the various number of processors, for instance, 4, 8, 12, 16, 32 and 40 processors (CPU cores) in Unix computer of my university.

In my simulation, there are 518 steel particles of 1 mm in diameter and they are getting attacked by sonotrode that vibrates with 20kHz.

Even though I simulated it changing the number of processors, the simulation speed does not prominently change depending on the number of processors.

To finish 600 seconds of simulation time, it will take more than one week...

Any suggestion to significantly increase the simulation speed while remaining nice quality of the data would be helpful.

Thanks,

Nakwon