How Long Does Freeze-Drying Take?

The Freeze-Drying Process Timeline

On average, a complete freeze-drying cycle takes anywhere from 20 to 60 hours, though some foods can take longer. Here’s a general breakdown:

1️⃣ Freezing Phase (9–12 hours) – The machine rapidly freezes the food to temperatures around -40°F.
2️⃣ Primary Drying Phase (10–20 hours) – A vacuum removes about 95% of the moisture from the food.
3️⃣ Secondary Drying Phase (2–15 hours) – The machine removes any remaining moisture to prevent spoilage.

Factors That Affect Freeze-Drying Time

• Food Type – High-water foods like watermelon take longer than low-water foods like bread.

• Slice Thickness – Thinner slices dry faster.

• Machine Size & Power – Larger machines handle more food but may take longer.

• Humidity & Temperature – High humidity can slow down drying.

Planning Your Freeze-Drying Sessions

Since the process can take a few days, it’s best to plan ahead. All freeze dryers allow you to start a batch in the evening and let it run overnight. You can also save time by pre-freezing your items in a deep freezer so they’re ready to go when you load them into the freeze dryer.

Ready to Start Freeze-Drying?

👉 Want to find the best freeze dryer for your needs? 

Check out my list of recommended freeze-drying machines, tools, and accessories.