May 08, 2012 · Now you have your growth rate (usually about 1 cm every 28 days or 1 inch every 71 days). So if, without cutting, the hair on your head eventually grows 16 inches long max, then your anagen phase lasts: (inches*period per inch). So using the average of 1 inch every 71 days, (16 inches * 71 days/inch) = approximately 1136 days or 3.11 years.
Tumbling classes