It looks like Schoolboy National Duals they will be using 2 - three minute periods.
That is what Louis Rosbottom (event director) is guessing, but it will be determined for certain in tonight's conference call by the Kids' National Executive Committee. I think the consensus, from the members that I've talked to, is to leave the Schoolboys at 3 minutes and drop the younger age groups to 2 minute periods. However, that is just conjecture at this point.