WOW!  Your system must have been several updates behind.  Of course there are other things that could slow your updates, such as the speed of your internet connection, or the Windows update server was slower because many others were doing the same updates as you were, or if you were using your computer for other things while the update was in process.  (sometimes I play solitaire while waiting for my computer to complete an operation ☺☺☺).

Anyway, glad your system did finally complete those updates.