I started back in August of 2011. Yes, you read that right. I had the entire back, sides and front covered within 2 days. (I used this FABULOUS series of tutorials from Miss Mustard Seed, which really helped me figure the process out. Highly recommend them.)
I hastily vowed to finish the slipcover before she came (which did not happen). And was moaning about my recently-noticed lack of progress here shortly afterwards, because another mama angel offered to come watch the kids for a day so I could work on it. Seriously!? It was awesome.