Final answer:
A qualified first-aider in FAW or EFAW should receive training every three years to ensure their skills and knowledge remain up-to-date.
Step-by-step explanation:
A first-aider who is qualified in First-Aid at Work (FAW) or Emergency First Aid at Work (EFAW) should receive training every three years. This is consistent with guidelines established by health and safety authorities. Continuing training at this interval helps to ensure that the first-aider's skills and knowledge remain current and effective, especially as new techniques and best practices may be introduced over time.
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