We had about 5 inches of heavily, HEAVILY packed ice and snow like a sandwich. Layer of ice, then snow mixed with ice and then ice to top it off. Could walk from my front door and around teh whole yard and barely leave a dent in it.
Took my mom and I 6 hard hours to clear it out. Was able to flag down a independent snow plow to get the last few meters from the front of the drive as well as a large chunk off to the side we didn't get.
My knees still hurt...but hot coco and NOES3 helped me relax.