I'm not sure. Way too many.....but that's because I didn't have the tools and I really don't have the space. I live in a townhouse and I don't have a garage or work area. So, getting things done meant either waiting until the weather was nice enough to go outside, or going to someone else's place.
If you have the tools (router, table saw, drill, paint sprayer) and the space, you could probably knock this entire project out in just a couple days.
The cabinet was cut on a CNC router, and could have been assembled and painted that same day if I would have had the hand router and saw at my house.
It really wasn't a bad project at all. Putting it together wasn't even bad on my own...just make sure you've got about 4 or 5 30" clamps or else the pieces will get misaligned or fall out as you put others in.
There were some little things that you'll need from an original cabinet: mainly the wood that is between the control panel and monitor (I guess you could make it, but it didn't look easy), the plastic bezel channels, and the metal bezel holder between the CP and bezel.
Putting the art on was really easy. Maybe an hour of work. We just put the game on its side and she held the art as I smoothed it on with a squeegee. I did the front myself in about 10 minutes.
I bet if you had all of the tools and parts ready to go, you could go start to finish in 10 hours, not counting sit time for the glue and paint to dry.