"I'm a 6th grade CCD teacher, and bought this craft to use during snippets of "down time" in class (before music, after prayer service, etc.) Took us a whole year to finish (I'd say over an hour total time). Lots of trouble with undrilled holes in beads. We taped ends of string or they would ravel and snag on rough beads. Lengths of string varied, so some could not finish entire 5 decades. In all, a disappointment."