It also depends on which HS team you are considering. Some of the top D1/D2 programs are run like high level club teams with travel tournaments outside ADHSHL and can play 40-50 games on their own between tournaments, ADHSL and CAHA playoffs, Nationals, etc. Top varsity HS teams like SM, JSerra, Capo, to name a few, certainly practice and play at a higher level than 16AA (age) and equal to or better than most 18AA.