If you are preferring to trade with the help of limit orders and then you must choose non-news hours as market may not show much volatility in such hours. Still, wild fluctuations may happen at any time hence placing stop-loss order at the time of placing entry order is also most mandatory one to secure your capital.
Non-news hours are not their cup of tea for the traders who prefer scalping or short term swing trading. Limit orders along with stoploss will definitely a powerful weapon on news hours if your technical analysis are good enough to predict the directions. These all are about the level of risks, you are affordable to manage.