I am optimistic... I told my wife and she said it took us more like 6 hours.... hhh But we did have to stop look for rocks and mix new batches of mortar... I ordered the M&G Duravent system. I wanted to get that flashing piece you recommended by ICC but I was told that I will then need to have my stack from ICC as well... I called a place not far from me and they wanted around $1400 before tax and I need to come pick it up. Instead, I ordered from woodstovepro.com.... $700 with tax and free shipping to my door.