The allure of forex day trading is that you can trade 24-hours a day. Unfortunately, that doesn't mean you should. Day traders should only trade a forex pair when it's active and there's lots of volume and transactions occurring. The EUR/USD has certain hours which are acceptable for day trading because there is enough volatility to generate profits which are likely greater than the cost of the spread and/or commission. To be efficient and capture the largest moves of the day, day traders hone in even further, often day trading only during a specific three to four-hour window.​

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The forex market operates 24-hours a day during the week because there's always a global market open somewhere due to time zone differences. But not every global market actively trades every currency. Therefore, different forex pairs are actively traded at different times of the day.

When London (and Europe) are open for business, pairs that involve the euro (EUR) or British pound (GBP) are more actively traded. When New York (U.S. and Canada) are open for business, pairs that involve the US dollar (USD) and Canadian dollar (CAD) are more active.