the last 10% of any project takes 90% of the time
This is somewhat how it is with a building too. As a building nears completion the details such as installing wires in conduit, finishing off plumbing installation, painting, trim carpentry do not impact the overall picture in big dramatic visual ways so the client always thinks there is nothing happening when we get to this point.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.

[SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.