I think it depends on how much you can afford.. I think there is a right or wrong answer. I normally set a cap for myself. Once it hits the cap, I sell them.
If my losses are too high I have to make a wise strategy to recover it. Small loss does not matters,In forex loss is a part of trading. we can not make profits just after loss. It would be a emotional way of trading or revenge from market . I avoid revenge , try to cut my loss slowly.
One loss or two is ok,I keep calm.. but when it's three in a day, I stop because it becomes obvious it's not the right trading day. Losses still effect me in a bad way.. they put me down.. so I think that when it's like that, it's better to sleep on it .
I agree with this. Let your losses be part of your trading journey, evaluate and learn something from them. Trial and error is needed for beginner traders because it's part of their learning process.
For new traders, losses could be an impact to your trading psychology. It's a wrong step to deal with losses by taking a 'revenge' order. I suggest you to calm yourself (you may turn off your pc and go somewhere quite) for a while, back and evaluate every single order in that day.