simulation takes more than one day

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hello everyone! I am new to openstudio and doing simulation of my 12 story building (72 spaces each storey). My questions are; 1. how to reduce the simulation time. its been 12 hours and still the simulation is at 66% (which was achieved in 20 minutes) 2. how to reduce the spaces but still covering the whole storey area?

I really need help. i would be very grateful for the answers thank you so much in advance.