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For UK GDP releases on GBPJPY, I use a fixed stand-aside timer. I do not touch the pair until it runs out.

GBPJPY is volatile on a normal day. After UK GDP at 07:00 London, it can move 40 to 60 pips in the first minute, with spreads several times wider than usual. Trying to trade inside that is mostly paying spread to the broker.

My timer:
- Flat at least five minutes before 07:00.
- From 07:00 to 07:05: no orders at all, not even pending ones. I just watch and note the spread every thirty seconds.
- From 07:05 to 07:15: still no trades, but I mark the high and low of the first five minutes.
- After 07:15: if spread is back near normal, I can look for a trade from the levels formed in the first fifteen minutes, at half size.

Why fifteen minutes: when I reviewed about two years of GDP releases on GBPJPY, the first reversal of the initial spike usually happened within ten to fifteen minutes. Trading before that was a coin flip with a big cost.

On days when GDP is released alongside other UK data, I extend the timer to twenty minutes. More numbers means more noise.

The timer turned GDP days from my worst GBPJPY days into mostly quiet ones.

I run almost the same timer, with one change. Instead of letting the clock alone release me at 07:15, I also need the spread under one and a half times its normal level for three consecutive minutes, which on a messy print can push my first trade to 07:25.

The chart below is an illustration of a typical morning, with the spike, the first five minute high and low marked, and the first proper reversal arriving around 07:11 inside the watch window. Nothing before the timer runs out is tradeable in that picture, which is the point.
The edge case I watch is when price is already outside the first five minute range at 07:15. That usually means the spike was the start of a real repricing rather than noise, so I skip the fade idea entirely and only consider pullbacks in the new direction.

I also log the size of that first five minute range against the GBPJPY daily average. When it is over half the daily average, my morning has usually been poor, so I now stop after one trade.

What do you do when the first five minutes already covers 80 pips or more? I lean towards no trade at all on those mornings, but my sample is small.

LondonScalper, one split that changed my timer is monthly versus quarterly GDP. In my notes the first minute on GBPJPY averages around 30 pips on a monthly only print, against about 55 when the quarterly preliminary figure lands.

So I run your fifteen minutes on quarterly mornings and cut it to ten on the monthly ones. Waiting the full fifteen on a small print mostly meant watching the first clean level form and leave without me.

The yen side can override all of it. If a Japanese official comment or a sharp Nikkei move hits during the window, I restart the clock from that moment, because the spike now has two causes.

Going back to full size is the other rule I had to write down. Half size stays on until the first M15 candle after 07:15 closes, since the earliest trades still carry release spreads in their fills.

The worst GDP mornings in my log were not the large surprises. They were in line prints where price swung both ways twice, and the timer was the only thing that kept me out.

Do you shorten the timer on monthly prints, or keep fifteen minutes for every release? A fixed timer is simpler, which counts for something at 07:00.