One of the most overlooked variables in automated trading is when your bot is allowed to trade. Traders spend enormous effort optimising entry logic, risk parameters, and exit strategies — then leave the EA running 24 hours a day, wondering why live performance diverges from backtests. The answer, more often than not, is session timing. The forex market is not equally liquid at all hours, and the conditions that produce clean, tradeable setups are concentrated in specific windows.
This guide maps the four global trading sessions, identifies which ones offer the best conditions for a Smart Money Concepts strategy, and explains exactly how to configure your MT5 EA's trading hours for maximum edge.
What Are the Four Forex Trading Sessions?
The forex market operates 24 hours a day, five days a week, but it is structured around four major regional sessions that open as business hours begin in each financial centre. Understanding each session's character is the first step to knowing when your bot should be active.
Sydney Session (10:00 PM – 07:00 AM GMT) The week opens in Sydney. Volume is the lowest of all sessions. The AUD, NZD, and JPY pairs see modest activity, but major pairs like EURUSD and GBPUSD are largely flat. Price tends to consolidate or make small, choppy moves. For most strategies — particularly those that require displacement and structure breaks — the Sydney session is a dead zone.
Tokyo Session (00:00 AM – 09:00 AM GMT) Asian business hours bring modest liquidity to JPY, AUD, and NZD pairs. The yen crosses (USDJPY, EURJPY, GBPJPY) can see meaningful moves during Tokyo, and the session sometimes sets up liquidity pools that London will later raid. For EURUSD and GBPUSD focused strategies, however, Tokyo remains low-volume and prone to false signals.
London Session (08:00 AM – 05:00 PM GMT) London is the world's largest forex trading hub, accounting for roughly 38% of daily global forex volume. The session opens with institutional banks re-entering the market after the overnight Asia session. This creates the conditions Smart Money Concepts traders rely on: deliberate liquidity sweeps, clean structure breaks, and impulsive displacement moves away from order blocks. The first two hours of the London open (08:00–10:00 GMT) are particularly active for major pair setups.
New York Session (01:00 PM – 10:00 PM GMT) New York is the second largest centre, contributing approximately 17% of daily volume. It drives USD pairs, and major economic releases — NFP, CPI, FOMC — are published during New York hours. The session can produce sharp, high-conviction moves, particularly after 01:30 PM GMT when US data hits.
Why Is the London Session the Best for SMC-Based Automated Trading?
London offers the highest raw volume and the cleanest institutional price action of any single session. Banks are re-evaluating overnight positions, institutional players are executing large orders, and the market has a defined directional bias that is easier to model algorithmically than the choppiness of Asian hours.
From a Smart Money Concepts perspective, London is where the "manipulation" phase most reliably occurs. Price will frequently sweep overnight highs or lows — collecting stop orders placed by Asian session traders — before reversing and moving impulsively in the true institutional direction. This sweep-and-reverse pattern is the lifeblood of an order block strategy. It creates the displacement move that validates an order block, and it happens with much greater regularity during London than any other session.
The H1 and H4 timeframes are particularly clean during London hours. Structure breaks are decisive, fair value gaps are genuine, and order blocks hold with the kind of conviction that makes automated execution reliable. Backtests that run 24/7 often show degraded performance because they are trading through Tokyo's noise — filtering to London and New York alone typically improves results dramatically.
What Makes the New York Session Worth Trading?
The New York session adds a second high-liquidity window and is essential for USD-denominated pairs. EURUSD, GBPUSD, and USDCAD all see their second major institutional activity push during New York hours.
Critically, many of the setups established during the London session complete or extend during New York. A bullish order block entry taken at 09:30 GMT during London may not reach its take profit until the New York session drives momentum further. Running your EA through the New York session ensures these trades are managed correctly through the full distribution phase, not cut short by an arbitrary session filter.
That said, the final hours of New York (07:00–10:00 PM GMT) tend to see declining liquidity as US banks wind down for the day. Strategy performance in this tail-end window is notably weaker, and many professional EA configurations exclude it entirely.
What Is the London-New York Overlap and Why Does It Matter?
The London-New York overlap runs from 01:00 PM to 05:00 PM GMT — four hours when both major financial centres are simultaneously active. This window accounts for a disproportionate share of daily volume and produces the most significant price moves of the trading day.
During the overlap, bid-ask spreads are at their tightest, slippage is minimal, and institutional order flow from both hemispheres collides. Major news releases almost always fall within this window. For an automated system, this combination of tight spreads and high directional conviction makes the overlap the single most valuable trading window in the forex calendar.
If you had to pick just one four-hour window for your EA to trade each day, the London-New York overlap would be the rational choice. RegimeTrader's default configuration prioritises this window with a higher confidence threshold for entries compared to standalone London or New York hours.
How Should You Configure Trading Hours in Your MT5 EA?
Most MT5 Expert Advisors allow you to set StartHour and EndHour input parameters — integers representing GMT hours during which the EA is permitted to open new trades. A sensible base configuration for a major pair strategy looks like this:
- Allow new entries: 08:00 GMT to 20:00 GMT (full London + New York window)
- Pause new entries: 12:30 PM to 01:30 PM GMT (around major US data releases, if no news filter is built in)
- Close all trades by: 10:00 PM GMT (end of New York, before Asian drift begins)
- Friday cutoff: No new entries after 6:00 PM GMT (avoid weekend gap risk)
Always work in GMT rather than broker server time to keep your configuration consistent across broker time zone offsets. Build in a check for broker DST adjustments if your EA will run through seasonal time changes.
Why Does RegimeTrader Focus on London and New York?
RegimeTrader was backtested and forward-tested against a London-and-New-York-only filter from the beginning. The performance difference compared to 24/7 operation was not marginal — it was substantial. Removing Asian session trades reduced the number of stop-outs from false structure breaks by roughly 40% in internal testing, while barely affecting the total number of qualifying setups.
The EA includes a built-in session filter with configurable GMT start and end hours, a Friday cutoff, and an optional news pause window linked to the MT5 economic calendar. All of these settings are documented in the RegimeTrader docs with recommended values for different currency pairs.
Compare session filter options across RegimeTrader's plans to see which tier gives you full session customisation control.
Start Trading Smarter Today
Trading at the right time is as important as trading with the right strategy. The London and New York sessions — and especially their overlap — are where institutional money moves, where Smart Money Concepts setups materialise, and where a well-configured EA earns its edge.
RegimeTrader is pre-configured for peak-session trading and can be live on your MT5 account within minutes.
Register your free RegimeTrader account and let the bot trade London and New York for you — with full session filter control and no coding required.
Want to understand how RegimeTrader measures its own performance? Read our post on what profit factor means and what makes a good one.
