This was our first wood-working project, and it was a BIG one. I think it took us about 50 hours, though we did add a couple complicating steps into the process. We installed full-extension drawer glides and stained instead of painting. Both of those added significantly to our time. We also added a lip around top solid wood planks to give it a more solid look, so of course that added to our time.
The plans were great, though we had a tough time keeping everything square. Our cabinet doors were 1 inch thick (1/2 inch door, plus 1/2 inch facade drawer fronts), and that made it almost IMPOSSIBLE to find hinges that would work with the cabinet doors. Cabinet hinges come ready to fit 3/4 inch doors OR whatever-thickness door with a 3/8 inch routed edge. So I ended up having to purchase some really heavy-duty specialized hinges from our specialty woodworking store, and those cost about $18/pair.
We're really happy with how it turned out, and it suits our needs great. See our process on my blog below.