https://www.dukascopy.com/swiss/english/marketwatch/fx-market-hours/
Best Currency Changing Times
7am – 10am
1m – 2pm
3.30pm – European exchanges close
7pm – US news
UK news is announced at 9.30am
US news is announced at 1.30pm, 3.30pm and 7pm
US dips around 4pm
US closes at 9pm

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