That’s tricky because there are so many different variables, as you’ve seen here. You also have to consider your position size, the larger the position size the faster you’ll get stopped out.
If a trade goes my way and I’m happy with the profits I’ll set a trailing stop at 5 pips, that way the max I’ll lose would only be 5 pips, but it still allows for further gains.
*Edit…GBP/USD is volatile and can move very fast, another thing to consider. It can move 10 pips compared to USD/CAD which will move just 1.