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Dehydrating mushrooms using low heat is the best way to preserve their earthy, umami flavor. It can take anywhere from 3 to 7 hours. You can crank the heat up to 115°F (56°C) if you want them to dry a little faster. Using too much heat can cause the mushrooms to lose their flavor. Once all of the mushrooms are crispy, slide the trays out of the dehydrator and let them cool on the countertop for 1 hour or until they’re completely cool to the touch. If you notice that some of the mushrooms still seem moist or are able to bend, place those onto a different dehydrating tray and continue to dry them. in an airtight container. Storing the mushrooms in glass jars with airtight lids is a good option, but you can also store them in airtight zipper bags. Place the vessel in a cool, dark place and they’ll stay good for 6 months to 1 year.  To rehydrate them, pour boiling water over the mushrooms and let them soak for 20 to 30 minutes. Use dried mushrooms to flavor soups and sauces. Dried mushrooms are no longer effective when they lose their scent (typically after 1 year).

Summary:
Preheat your dehydrator to 110°F (43°C). Remove the dried mushrooms from the dehydrator and let them cool. Store the dried mushrooms