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Forex trades around the clock on weekdays, but it does not trade evenly. The day rolls through Sydney, Tokyo, London and New York, and each centre brings its own participants, its own pairs and its own energy. Volume, volatility and spread all follow that rotation, which means the same strategy can behave completely differently depending on the hour you run it.

The London session is the largest by volume, and the London–New York overlap is the deepest and usually the most volatile stretch of the day. Majors like EUR/USD and GBP/USD do a large share of their daily range there, and spreads are typically at their tightest. If you can only trade for a few hours, that overlap is usually the most efficient window to choose.

The late New York and early Asian hours are the opposite: thinner books, wider spreads, and ranges that can look like a trend until the volume arrives and erases it. Yen and Aussie crosses are relatively more active in Asia, but for most beginners on the majors these hours are where costs are highest relative to opportunity.

Choosing your hours deliberately is one of the cheapest edges available to a retail trader. It costs nothing but attention.

Two structural events deserve calendar entries of their own. The daily rollover — when swap is applied and many desks change books — routinely widens spreads for a few minutes. And the Friday close into the Sunday open leaves a gap risk that no stop can protect against, because the market is shut while the news happens.

None of this tells you which direction to trade. It tells you when your costs are lowest and when your assumptions about liquidity are safest. Choosing your hours deliberately is one of the cheapest edges available to a retail trader, and it costs nothing but attention.