Random Vibration

Hi, 

We are running a Random Vibration analysis. Number of frequency modes is 250 to get the recommend mass participation. When we meshed the full surface model for the cabinet, the DOF is around 1.1 million. When running the analysis the total number of steps being shown are 1551 steps, and so far in 2 hours only 50 steps have been completed.By this rate it will take 3 days to complete the study. Any recommendations to complete the study earlier?

Thanks for any recommendations.