Classic WoW Raid Reset Days and Schedule
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Blizzard clarified the raid reset schedule during Classic WoW--it will work just like vanilla, with some instances resetting on different days. This schedule was originally added in Patch 1.9. Usually instances reset during the weekly maintenance, but as WoW has improved infrastructure over the years, some weeks may not have maintenance.
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Source: Classic WoW Raid Reset Days and Schedule (https://www.wowhead.com/news=294595/classic-wow-raid-reset-days-and-schedule)