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Barry it depends what the trigger was. If it was say, a drink of tonic water, maybe a couple of hours. If it was too much wheat, maybe a day. If it’s stress, avoid it if possible and try not to anticipate it as the fear can tighten your throat muscles and also affect your swallowing. I lost my voice once during a very difficult life event. What helped me was a Bach Flower Remedy called Centaury taken with Rescue remedy. I am in Australia and Bach Flowers are readily available here. Also meditation and massage. I became a natural therapist in my mid fifties to help myself and others so this might sound a bit out of “left field”. My sympathy and the best of luck.