@User: Part of the netgen setup file ignores the decap and fill cells. If you don't do that, netgen goes into a very tedious process of flattening them. However, in the worst case I've seen so far (the striVe SoC core, which was about 2mm x 2mm or more), it only ran for maybe 10 minutes at most. With eight hours, it seems most likely that something else is going on.