Battles occur every 76 hours? (3 Days?) 50 hour prep + 26 hour battle, then 50 hour reset?

How many Instances can occur at once? How many 8-man PT's can participate?

Does the 26 hour Battle continue for the full 26 hours regardless if a PT "Wins" their instance?

Why is Class-Stacking seemingly encouraged via the bonus scores and how do the bonuses relate to rewards? (and what are the rewards?...Seals, Exp, what?)

Is this a Grand Company or "Open" event? Are there "same company" bonuses or do GC's and GC Seals have nothing to do with this event?

All battles are fought within instanced areas. A battle is won by either defeating the beast tribe leader, or protecting the hamlet’s four supply caches for the duration of the raid.
Hmmm...so if you do not defeat the "Boss" you have to defend the Supply Carts for 25 hours ? OR is each 8-man instance a timed raid that repeats during the 25 hour period? (and if so, how long is the timed raid?)

If each instance is a "mini-raid", will the "Bosses" be different or will we be killing the same "Tribe Leader" over & over?