As you can see in the image itself for creating a single file of 0.01 s of simulation time it is taking more than an hour of walltime.
I am using 24 cores and distribution given in image
SQP is known to be slow but possibly we can adjust some convergence criteria to speed things up. Please upload your simulation so I can have a look (Main menu/Submit bug report)
Error 1100: FATAL - DEM particle input file not found!
Please attach all files needed to run the simulation. The easiest way to do this is ‘Submit bug report’ on the main menu which will make a ZIP file containing all inputs.