I have a 250 GB raster dataset in a file geodatabase. I am trying to remove the pyramids using the build pyramids tool with pyramid levels set to 0, running in ArcCatalog 10.1 SP 1. It's going on two days and I am wondering how long I might expect this process to take. I thought removing pyramids would a relatively 'easy' process (as compared to building them) and be done in a couple of hours at most for such a large raster. Of course I have no way to tell if it is progressing, however the Task Manager shows that it is running. Anyone have any thoughts on this?