I did a little research on the history of # of races and # of races per day (when I could figure it out) of the H-16 North Americans over the last 11 years:

2008 - 2/0/7/5/1 = 15 total
2007 - ?/?/?/?/? = 18
2006 - 4/4/2/2/5 = 16
2005 - 16 in 4 days (rotations), then 3 in finals = 11 raced
2004 - 3/3/?/?/? = 13
2003 - = 13
2002 - = 10 (Mega)
2001 - = 14
2000 - 5/3/4/1/4 = 17
1999 - = 11
1998 - = 16

The average number of races / event is 14.00
7 races in one day is apparently unprecedented, at least in the 16's.

We really didn't need the last race in 2006 in RI. It was 64 degrees, pouring rain and it was my worst race of the day. <img src="http://www.catsailor.com/forums/images/graemlins/grin.gif" alt="" />

I'm good with 4 / 5 races a day (5 when you're behind schedule / nice day w/nice breeze).