The busiest time of day for EUR/USD is usually...

The London and New York overlap

A jump in price when trading resumes

The market clock | TradeLiga

Forex trades 24 hours a day, five days a week. It follows the sun through three main sessions: Asia-Pacific (Sydney, Tokyo), Europe (London) and America (New York).
London is the busiest centre: close to 40% of all currency trading happens there.
From about 8 a.m. to noon New York time, London and New York are both open. In this overlap trading is busiest, prices move most and spreads are usually tightest.
Your own clock is different. London opens at about 2 or 3 p.m. in Jakarta, 9 a.m. in Madrid and 1 or 2 a.m. in Mexico City, depending on daylight saving.
At 5 p.m. New York time the trading day rolls over: spreads widen for a while and overnight fees are charged. At weekends the market shuts, so news can make prices gap when it reopens.
Common mistake
Myth: forex is just as busy at any hour. In quiet hours fewer traders are active, so spreads are wider and small orders can jolt the price. Busy hours are usually cheaper to trade.
Key takeaway
Learn the market clock in your own time zone. The overlap is the busiest time; the rollover and weekends bring wider spreads and gaps.

Which city trades the most currency? LondonLondon sits between Asian and American hours and handles close to 40% of all currency trading.
The busiest time of day for EUR/USD is usually... The London and New York overlapWhen both big centres are open, the most traders are active, so prices move most and spreads are tight.
A gap is... A jump in price when trading resumesIf news breaks while the market is shut, the first price after the reopen can be far from the last one.
What happens at 5 p.m. New York time? The daily rollover5 p.m. New York time ends one trading day and starts the next. Spreads widen briefly and overnight fees are charged.