This is super fast knit, can be finished in a couple hours. BASIC SKILLS NECESSARY cable , knitting using dpns, knitting in a round GAUGE 7.5 stitches 11.5 rows for 4" square. SIZING / FINISHED MEASUREMENTS Adult. Head circumference 21 (22) inches (54-56cm). The full finished length of the hat is 9" (23cm) after blocking.