Going by your logic you'd still have to maintain the camp until Vox spawned and if you wiped your chance would be over; no second chances that is provided in that 30 minute window.
I'll nitpick if you nitpick.
As it stands with the rules you are picking apart: you have to maintain a camp of 15+ in zone until Vox spawns. Most likely another raid force will roll call you. Assuming you answer the roll call successfully, you will then have unlimited time to kill Vox. If you wipe, your chance is over.
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