Well, let's see the one I did last year took me about 2 hours to do. Course I did not do any of the shaving of pumpkin skin, and just plain cut out a design. And I am partially OCD so everything needs to be perfect with certain things, Pumpking carving be one of them fro some reason.
The one I did today for this year's. Took me about 7 hours, so glad I had the free time today. And all the Bronies out there should like this, since it is Rainbow Dash wearing a "F" shirt. (F is for Fakku, I was going to also put "!" but was no room.) Anyway, Pics are below, first one is with only the candles on inside the pumpkin. Second one (in the spoiler) is with a outside light on so can see the full carving. Enjoy.