*Among US retail brokers. Robinhood 24 Hour Market is available from Sunday 8 PM ET through Friday 8 PM ET. Orders entered for the 24 Hour Market generally could be executed 12 AM-8 PM ET on a full trading day (meaning Monday-Friday except for stock market holidays and half-days), 12 AM-5 PM ET on a stock market half-day, and 8 PM-12 A M ET on the day before either a full trading day or a ... More @Wikipedia
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