That is my analysis too. Most is won or lost ont he start and first lag then some can be retrieved on the downwind leg and second lap. After that it is pretty much fixed. Even tacticat shows something like this.

Personally I do rather 3 races of about 45 min per day then two 70 min ones. Time spend on the water is the same with both (including 5 min starts) !

3 races per day also allows a rest day without cutting too much in the total number of races over the event. For an event like this I think we should aim for at least 7 races before the event has ended, taking into account losing an additional day to weather or something (no wind for example).

Wouter