There are a lot of variables concerning this question.
Grip: Custom turned= glue up, shaping, inletting, sizing to blank
Reel seat: turning and finishing of insert if skeleton style
Guides: prep if necessary
Assembly: Final fitting and glue up
Rod: Initial spacing and stress testing of guide layout
Wraps: Complexity of the wrap to be be used
Finish: CP applied ? Finish applied and # of coats used
All the above plus the allotted drying time have to be taken into consideration.
Also as Betty stated, this does not take into account any necessary re-do's on the possibility of any of the unsatisfactory steps above.