These are simple desktop clocks....construction time varies from a couple of hours to perhaps three or four hours..depending on the complexity of the design (lathe work, glue-up, etc.) I used to get the movements from klockit (3" dia. For under $8.00 ea., but they've gone insane with their prices lately...about 14 dollars😱😤😡... I buy them for my students to use in their projects...most of the kids never pay for the stuff I supply so I'm gonna have to find a more economical source for my clock parts...