I know they begin when they open, but they end around the late afternoon. Perhaps 2 or 3. There's no dinner dim sum service.
In the past they served Dim Sum from the menu all day.
According to the internet they are open 830am-11pm everyday. Their peak hours are 1030am-230 pm. I recommend calling if you need more information. (206) 621-2228
If I remember correctly it is open until 11 PM
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