Check out my build thread...I did it as a week long project. Cut and outside first night in half hour. Routed sub mount and port walls and finished outer in half hour the next night. Then did all the inside walls in half hour the next night. Then second side and routing the outside and mounting the sub in about an hour the last night. Then tossed it in that weekend.
I also didn't use any screws, just glue and a lot of clamps, so it took me longer than it normally would have.
Hell, it took me twice as long just to draw the box up and design it. I also designed it while I was at work waiting for my computer to stop being stupid.