If the mesh generation is taking several hours and looks to be restarting as I check on it, is this a early sign that mesh or geometry of model should be re-examined?  Everything set to default mesh settings, no local mesh refinement yet.  Outlet at standard pressure with inlet at a volume flow rate.  If you have too large a mesh would this happen?  The only geometry issue I noticed was a tangent line contact in the check geometry results, but beside line item the solver stated resolved.  If the solver says resolved for issue, do I necessary have to fix it?

Computer

32 GB RAM

Intel Xeon 3 GHz

Model

A 6' x 6' x 2' box with an inlet and outlet. 

Box contains 64 parts to be cooled in a x/y array pattern