I happen to have an operating hours brochure from May, 2003. Mother's Day was May 11, 2003.
May 10 9 am-9 pm
May 11, 12 9 am-7 pm
May 13 9 am- 9:30pm
May 14-16 9 am- 7 pm
May 17 9 am-9 pm
But, WDW has set a goal of showing Wishes nightly this year, if possible. So, expect the hours to change slightly (later) to allow for it to get dark in the spring and fall months.
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