Doublegun,
I had to get the bluing done myself. I took it to a local guy who does just metal finishing. I could have did browning myself, but I have not been bitten by the PC bug yet and I simply like bluing better. Of course, I may not have seen a good browning job yet.
So far as hours, I would have to estimate from 25-35.
For all major components, it is pretty much a drop in affair. In fact, all major components like the lock, trigger and butt plate come installed on the rough stock. The barrel did require some minor inletting of the stock to lay in right.
Now, having said that, the stock requires quite a bit of wood work to get it where you want it. Over most areas and metal to wood joints there is anywhere fom 1/16 to 1/4 of an inch of extra wood. The other thing I disliked about most finished GPRs is the bulge in the wood underneath the forestock and that was some effort in removing. A good sanding block and some quality paper answered all the above problems.
The biggest effort, by far, was the metal polishing. You could leave it alone and keep the rough finish for browning, but most parts have casting lines and once you go to remove them, you are pretty well committed to polishing the metal. The only parts I did not have to do metal finishing work was on the lock assembly and trigger assembly, but the trigger did need internal polishing. I would easily estimate that the metal took 2/3 of the time. The barrel was pretty easy to draw file/polish with a good 12" mill bastard file and sand paper. I took all metal up to 320 grit and then cleaned it up with 0000 steel wool.