Why SharePoint 2013 Cumulative Update takes 5 hours to install?

We can complete SharePoint cu update within 30 mins, for this we need to follow below mention steps below run cu exe.

Step 1:  Stop IIS

                Open command prompt run : IISReset \stop

Step 2:  Stop SharePoint timer service

                Go to run: services.msc

Step 3: Run CU exe file

Step 4: after complete exe start IIS

                Open command prompt run: IISReset \start

Step 5: Run SharePoint timer service

                Go to run: services.msc

Step 6: Restart the server

Step 7: Run SharePoint config wizard (after start server)

Step 8: Installed SharePoint CU update within 30 mins