I think 10 minutes is a good amount of time for resets. Casters can gate out, but melees would be left stranded, especially leveling melees during a zone repop. High level characters/melees are expected to have an OT hammer or WC hat, but you can't expect a L30 melee in a group in the bottom of LGuk to be able to walk himself out because the casters gated.
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