While applying breakout strategy, we should understand the mechanism of the movement. When a strong level is broken, the impulse is made by participants’ stop losses and other scalpers participating in the movement. It takes a few seconds for initial impulse to be realized, regardless of how long it takes further (0.8% or >10% of movement).
If you entered the market waiting for the impulse, and it is not realized during more than 30 seconds, it is better closing the position due to lack of participants or stop losses as a core fuel of the level breakout. Holding opened position in such situation is risky, as a pullback could happen, increasing your lose. Sometimes the realization of an impulse could happen even with a long delay after breaking the level, however waiting for it with an open position is a lottery.