Yep thats a party I'd like to join but my leads are a bit short.
You could run it on the internet with 'mother ships' maintaining comms - there would be inevitable dropping wasteage but the initial allocation
of team members could attempt to allow for this. 3-4 hours is the best I've done.
Sorry they're just playing 'Land of hope and glory' at the last night of the Proms - always fires me up............................................a bit !