Site finished, stairs, risers, and balusters for 1700. 
I bet he didn't use a jigsaw to cut em. That would take another 3 minutes per step.
On mine, you might be able to slide a dollar bill (no, not a credit card) between the tread and skirt. I cut em that way intentionally.
I could cut and nail one in in about an hour, but it's taking me more time to shim them to where they need to be so the tread is level and the riser plumb.
Both dimensions are about 1/8" out at the nose area on all the stringers. I didn't figure glue was supposed to make fills anywhere near that deep.
My shimming may be overboard. The shims fit the depth of the stringer or to wherever they need to stop at........... 1/8 to zero or whatever.
I'm doing all the cuts outside, at the bottom of the front steps, so each trip outside to make a cut, or sand down a shim is about 50 feet plus 10 steps round trip.
I can see why stairways are expensive to have done.
