If they add King/Wyrm like HNMs I would rather there be no respawn time and No Windows. Try to make it where it just simply spawns randomly.

1) Make it where it can spawn again in like 10secs all the way up to it can take 5 days on main hnms.
2) Make it have a large Spawn area... sorta like All of Corethas, or The whole eastern part of Thanalan. Something that while I guess still doable would just not be reasonable to camp especially with no timer or windows. OR do the sandworm/DI thing make it randomly spawn in any zone, anywhere more or less.

If they make the window with a massive large range and the area vast enough... gona make it really hard to actually effectively camp and monopolize anything.

Timers are not a bad idea on claim either, make it something like the Wyrm fades into the mist and despawns to repop somewhere else if you are not outside the cooldown yet and make it where if 1 person in the party has the timer up no one in the group can claim it unless the person is droped.