Here is the some background. I am trying to create streams from DEM. The DEM data is LiDAR product, in 1 meter resolution. I exported a small area of the province. The number of raster cells = 1200million. I did the hydroconditioning of the DEM, Fill and Flow Direction. All finished successfully within decent time. But the Flow Accumulation took 40 hours to finish.
I was watching an online video on ArcHydro. The presenter said that the tools can be run on any size of data from a watershed to a whole state or even a country. I want to know how you would run the Flow Accumulation Tool for a state , in my case, a province.