How long does it take to dehydrate fruit?

Dehydrating fruit removes moisture below 20% — the threshold where bacteria and mold can't grow. Time depends on water content, slice thickness, and target texture.

Standard temperature: 135°F (57°C). Lower temps preserve more enzymes/vitamins but take 2–3× longer. Higher temps "case-harden" fruit (hard outside, wet inside).

Timing per fruit at 135°F, 1/4" slices: - Apples: 6–10 hours (target: leathery, slight pliability) - Bananas: 8–12 hours - Pears: 12–18 hours (higher water content) - Peaches: 10–14 hours - Plums: 16–22 hours (firm skin slows it) - Strawberries (sliced): 10–14 hours - Whole grapes (raisin-making): 18–24 hours - Cherries (pitted halves): 12–16 hours - Pineapple (1/4" rings): 14–18 hours - Mango (sliced): 10–14 hours

The "done" test: fruit should bend but not break (leathery). For longer shelf life, dry until brittle but be aware brittle fruit absorbs moisture from air and rehydrates if not airtight stored.

Conditioning (after dehydration): put dried fruit in glass jar, leave 1 week shaking daily. Distributes residual moisture evenly. If condensation forms inside jar → dehydrate longer.

Sun-drying alternative: 2–4 days in direct sun at 85°F+ with low humidity. Requires fly screen + bringing inside overnight. Works for grapes, apricots, plums in dry climates.

Storage: properly dehydrated fruit keeps 6–12 months in airtight container, 1–2 years vacuum-sealed, 25+ years frozen. Watch for mold — discard any batch with visible spoilage.

Dehydrating mid-range fruits (apricots, peaches, pears) sometimes uses ascorbic acid (vitamin C) dip first to prevent oxidative browning. Not necessary for flavor or safety.