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I would say that with steel reinforcement to prevent it from collapsing from all the cracks it would hold up for a very long time. Even if the wall is breached it will simply give you a hole to shoot from while you hide behind another section.
Also dirt has excellent properties for stopping bullets. As bullets hit dirt the dirt above tends to fill in the tunnels created by the bullets and even high powered bullets will get slowed down considerably in dirt or sand.
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